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STATS quiz

1.
Which
of the following is a matched pairs design?
A) Measure levels
of depression for a random sample of internet users and for a random sample of
non-users.
B) Measure level
of depression for a random sample on non-internet users: provide them with
internet use for a year and then measure their level of depression.

2.
Which
of the the following techniques is best used for QUANTITATIVE data?
A) Histogram
B) Pie Chart
C) Two-way Table
D) Bar Chart

3.
Suppose
the distirbution of speeds at an interstate highway location is bell-shaped
with a mean of 73mph and a standard deviation of 4mph. About 95% of vehicles at
this location travel between ____ and ____ mph?
A) 65 and 81 mph
B) 69 and 77 mph
C) 61 and 85 mph

4.
Which
one of the following variables is discrete?
A) The number of
automobiles produced by Ford
B) The daily high
temperature in Chicago
C) The age of the
students in our class
D) The weight of
the students in our class
E) The
manufacturer of an automobile

5.
.png” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/ex1_histo.gif”>

From the histogram above, which of the following would we expect to be true?
A) The median would
be less than the mean
B) The median
would be greater than the mean
C) The median
would be equal with the mean

6.
Find
the mean for the following set of values: 12, 14, 19, 13, 17.
A) 14.5
B) 14
C) 18.75
D) 15

7.
A
study found that students who procrastinate are more likely to get colds. A
sample of 300 college students was asked how often they procrastinate and if
they’ve had a cold in the last two months. Below is a two-way table of counts
(rows = whether or not procrastinates).

.png” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/procras_cold_table.png”>

State the appropriate null hypotheses for this study.
A) There is no
relationship in the population between Procrastination and Having a
Cold.
B) There is no
relationship in the sample between Procrastination and Having a Cold.
C) There is
relationship in the population between Procrastination and Having a
Cold.
D) There is
relationship in the sample between Procrastination and Having a Cold.

8.
A research
project was conducted to study whether gender plays a role in the acceptance of
a student into vocational education programs. A random sample of 200 applicants
for vocational education was selected from a school district. The data were
then summarized into table shown below.

.png”>

The appropriate alternative hypotheses for this study is that gender and
acceptance are associated.
A) True
B) False

9.
A
research project was conducted to study whether gender plays a role in the
acceptance of a student into vocational education programs. A random sample of
200 applicants for vocaional education was selected from a school district. The
data were then summarized into table shown below.

.gif” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/table_assoc_03.gif”>

What are the odds of acceptance for females?
A) 45/35
B) 45/80
C) 35/80
D) 45/200

10.
.jpg” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/lr_001.gif”>

Using the above regression output, what is the correct regression equation?
A) y-hat = – 21.04
+ 0.5666X1
B) y-hat = 0.5666
– 21.04X1
C) y-hat = 16.00 +
0.1475X1
D) y-hat = 16.00 +
0.5666X1

11.

.jpg” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/lr_001.gif”>

Using the above regression output, then the correlation between X1 and Y would
be calculated by taking:
A) The positive
square root of 0.45
B) 0.45 times 0.45

C) The negative
square root of 0.45

12
.jpg” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/lr_001.gif”>

Using the above regression output, how much of the variation in Y is explained
by X1?
A) 45%
B) 42%
C) The positive
square root of 0.45
D) 3.98537%

13.

.png” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/ex3_1prop_ht.gif”>

Based on the output above, what are the null and alternative hypotheses?
A) Ho: p =
0.2 Ha: p ? 0.2
B) Ho:
p?hat = 0.2 Ha: p?hat ? 0.2
C) Ho: p =
0.2 Ha: p < 0.2 D) Ho: p?hat = 0.2 Ha: p?hat < 0.2 E) Ho: ? = 0.2 Ha: ? < 0.2 F) Ho: ? = 0.2 Ha: ? ? 0.2 14. .png" alt="https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/hypoth_output.png">

Based on the output above, what is the value of the test statistic?
A) 0.2
B) 0.142
C) -0.85
D) 0.398

15.

.jpg” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/one_mu.gif”>

Based on the above output what is the standard error of the mean?
A) 0.10
B) 0.50
C) 12.5
D) About 0.6

16.

.png” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/hypoth_mean_output.png”>

Based on the output above, what would be the degrees of freedom used to find
the p-value?
A) 25
B) 24
C) 3.5
D) 3.15

17.

From a
class survey, 90% confidence intervals were created for both the females and
males who responded Yes to having smoked marijuana. The 90% confidence
intervals were 0.417 to 0.565 for the females and 0.437 to 0.609 for the males.
What conclusions can we draw in regards to the population proportions of
females and males who said that they have tried marijuana?
A) We cannot
conclude there is a difference between the population proportions.
B) We cannot
conclude there is a difference between the sample proportions.
C) Males are more
likely than females to have tried marijuana.
D) Males are less
likely than females to have tried marijuana.

18.

Which
of the following quantities does NOT affect sample size for estimating a
population mean?
A) the confidence
level
B) the sample
standard deviation
C) the margin of
error
D) the sample mean

19.

If you
were conducting a two sample T?test to compare two means, which of the
following would allow you to properly use the pooled method in order to perform
the test?
A) If the larger
sample standard deviation was 5 and the smaller sample standard deviation was 4

B) If the larger
sample mean was 5 and the smaller sample mean was 4
C) If the larger
standard error was 5 and the smaller standard error was 4

20.

Two TV
commercials are developed for marketing a new product. 180 people have been
randomly selected and split into two groups of 90 each. In a controlled
setting, Group A watches commercial A and Group B watches commercial B. In
Group A, 25 say they would buy the product. In Group B, 30 say they would buy
the product.

To test which commercial has better effect, two proportion z test could be
applied here since all assumptions have been satisfied.
A) True
B) False

21.

Identify
whether the comparison is based on two independent samples or paired data:

We test if the average number of hours studied by all college freshman living
in a particular dorm for their math course differs from number of hours studied
in their chemistry course during a particular semester for each student in the
study.
A) Paired
B) Independent

22.

.jpg” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/anova_001.gif”>

Based on the above ANOVA output, how many means are being tested?
A) 4
B) 3
C) 301
D) 304

23.

.jpg” alt=”https://cms.psu.edu/WorldCampus/201314SP/201314SPWD___RSTAT_200_005/_assoc/6DF87B22CD1346A59D590D9238A2C33D/anova_001.gif”>

Based on the above ANOVA output, what conclusion should be made regarding the
means?
A) With p-value of
0.000 conclude that not all of the means are equal.
B) With p-value of
0.000 conclude that all of the means are different
C) With p-value of
0.000 conclude that all of the means are equal

24.

Based
on the number and types of variables present, select the most appropriate
display for each of the following:

Number of Hours spent watching TV per day for a representative sample of
Americans.
A) Bar Graph
B) Histogram
C) Two-way table
D) Scatterplot
E) Side-by-Side
Boxplots

25.

Based
on the number and types of variables present, select the most appropriate
display for each of the following:

Actual Height (in inches) and Ideal Height (in inches) for a representative
sample of PSU students.
A) Bar Graph
B) Histogram
C) Two-way table
D) Scatterplot
E) Side-by-Side
Boxplots26.

Select
the most appropriate statistical test for each of the following:

We examine a random sample of State College apartments to see on average how
much rent increases per unit increase of square footage:
A) 1 Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D) Two-sample t-test with a one-sided
alternative
E) Two-sample t-test with a two-sided
alternative
F) Chi-square test
G) One-Way ANOVA test
H)
Regression

27.

Select
the most appropriate statistical test for each of the following:

We take random samples of African-American, White, Asian, and Hispanic workers
to determine if mean earnings differ among these groups:
A) 1 Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D) Two-sample t-test with a one-sided
alternative
E) Two-sample t-test with a two-sided
alternative
F) Chi-square test
G) One-Way
ANOVA test
H) Regression

28.

Select
the most appropriate statistical test for each of the following:

We want to test for a relationship between race and employment status (employed
or unemployed):
A) 1 Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D) Two-sample t-test with a one-sided
alternative
E) Two-sample t-test with a two-sided
alternative
F)
Chi-square test
G) One-Way ANOVA test
H) Regression

29.

Select
the most appropriate statistical test for each of the following:

We want to test if men have a higher salary than women in the field of
engineering using a random sample of male engineers and a random sample of
female engineers.
A) 1 Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D)
Two-sample t-test with a one-sided alternative.
E) Two-sample t-test with a two-sided
alternative.
F) Chi-square test
G) One-Way ANOVA test
H) Regression

30.

Select
the most appropriate statistical test for each of the following:

We want to test if more than 50% of children get a cold each Winter.
A) 1
Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D) Two-sample t-test with a one-sided
alternative
E) Two-sample t-test with a two-sided
alternative
F) Chi-square test
G) One-Way ANOVA test
H) Regression

31.

Select
the most appropriate statistical test for each of the following:

A researcher wants to see if female Caucasians are more likely to have blue
eyes than male Caucasians. What hypothesis test should be used?
A) One population proportion
B)
Difference between two population proportions
C) One population mean
D) Population mean difference (paired data)
E) Difference between two population means
(independent data)

32.

Select
the most appropriate statistical test for each of the following:

We survey a random sample of households in Philadelphia to test if less than
50% of families are families where both parents are working full time.
A) T-test about a mean with a one-sided
alternative
B) T-test about a mean with a two-sided
alternative
C) Chi-square test of independence
D) Z-test
about a proportion with a one-sided alternative
E) Z-test about a proportion with a two-sided
alternative
F) One-way Analysis of Variance (ANOVA)
G) Regression

33.

Select
the most appropriate statistical test for each of the following:

We test if the mean rent of all downtown Pittsburgh one bedroom apartments is
different from the mean rent of all non-downtown one bedroom apartments by
examining a random sample of downtown one-bedroom apartments and a random
sample of non-downtown one-bedroom apartments.
A) 1 Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D) Two-sample t-test with a one-sided
alternative
E)
Two-sample t-test with a two-sided alternative
F) Chi-square test
G) One-Way ANOVA test
H) Regression

34.

Select
the proper NULL hypothesis:

Fifty students have their blood pressures before and after an exam. We wish to
know if there is an increase, on average.
A) H0:pd = 0
B) H0:p-hat1 – p-hat2
= 0
C) H0:?d
= 0
D) H0:x-bar1 – x-bar2
= 0

35.

Select
the proper NULL hypothesis:

A class survey is used to compare the GPAs of male and female students.
A) H0:p1 – p2
= 0
B) H0:p-hat1 – p-hat2
= 0
C) H0:?1
– ?2 = 0
D) H0:x-bar1 – x-bar2
= 0

36.

Select
the proper NULL hypothesis:

A study was conducted to see if there is a difference between blood pressures
of husbands and their wives.
A) H0:pd =
0
B) H0:p-hat1 – p-hat2 = 0
C) H0:µd = 0
D) H0:x-bar1 – x-bar2 = 0

37.

Identify
whether the comparison is based on two independent samples or paired data:

In a nationwide survey, people are asked if they think crime is a problem in
their town or not. The proportion saying yes is compared for people from large
cities versus people in small towns and rural areas.
A)
Independent
B) Paired

38.

Identify
whether the comparison is based on two independent samples or paired data:

Fifty students have their blood pressures before and after an exam. We wish to
know if there is an increase, on average.
A) Independent
B) Paired

39.

A
statistics class has 4 teaching assistants (TAs): three female assistants
(Lauren, Rona, and Leila) and one male assistant (Josh). Each TA teaches one
discussion section. A student picks a discussion section. The two events W =
{the TA is a woman} and J = {the TA is Josh} are
A) independent events.
B) mutually
exclusive events.
C) each simple events.
D) None of the above.

40.

Three
people are selected randomly one at a time from a group of 10 people as
representatives of the group. The group consists of 3 female and 7 male. What
is the probability for the three people selected to consist of (by order of
selection): Female, Female, Male.
A) 0.809524
B) 0.97619
C) 0.015873
D) 0.0583

41.

Which
one of the following statements is true?
A)
Increasing the sample size of a survey decreases the margin of error.
B) Increasing the sample size of a survey
increases the margin of error.
C) Increasing the sample size of a survey
decreases the impact of response bias.
D) Increasing the sample size of a survey
increases the impact of response bias.

42.

In
order to test if a coin is a fair coin, the coin is tossed 100 times and the
results (Head or Tail) were recorded for analysis. What is the sample in this
study?
A) the coin
B) the
outcomes of the 100 tosses
C) probability of the coin to show Head
D) percentage of Heads in the 100 outcomes

43.

Which
of the following is NOT part of the 5-number summary?
A) Mean
B) Median
C) Maximum
D) Minimum
E) All of choices are part of the 5-number
summary.

44.

Exams
scores (in percentages) range from 0 to 100. Suppose an exam for STAT 200 was
easy and most of the students scored very well with only a few students scoring
low. Which would best describe the shape of the distribution?
A) Right skewed
B) Left
skewed
C) Bell-shaped
D) Not enough information to tell

45.

A
student does not study for a 10 question multiple choice quiz, with five answer
choices for each question, so he randomly guesses an answer for every question.
Which choice below describes how to find the probability that this student gets
exactly 7 questions correct?
A) Find cumulative probability for 7 successes
for a binomial variable with n = 10 and p = 7/10.
B) Find cumulative probability for 7 successes
for a binomial variable with n = 10 and p = 1/5.
C) Find
probability of 7 successes for a binomial variable with n = 10 and p = 1/5
D) Find probability of 7 successes for a
binomial variable with n = 10 and p = 7/10

46.

Correctly
identify whether the following situations satisfy the conditions required to
conduct a Binomial experiment. Rolling a die many times and observing whether
the number obtained is even or odd
A) Binomial
B) NOT Binomial

47.

Suppose
that for X = net amount won or lost in a lottery game, the expected value is
E(X) = -$0.50. What is the correct interpretation of this value?
A) The most likely outcome of a single play is
a net loss of 50 cents.
B) A player will have a net loss of 50 cents
every single time he or she plays this lottery game.
C) Over a
large number of plays the average outcome for plays is a net loss of 50 cents.
D) A mistake must have been made because it’s
impossible for an expected value to be negative

48.

Suppose
that X=number of heads out of 12 independent flips of a fair coin. What is the
expected value of x?
A) 6
B) 12
C) 5
D) 3

49.

The
purpose of having a control group in a study is
A) to
estimate the response when the treatment is not applied.
B) to decrease the margin of error.
C) to be able to blind the subjects.
D) to make the samples more representative.

50.

Randomly
chosen 988 American adults participated in a poll regarding whether to approve
a new gun control legislation. What is the parmaeter of interest in this study?

A) the
proportion of American adults who approve the new gun control legislation
B) the proportion of the 988 people who
approve the the new gun control legislation
C) Is the new gun control legislation
beneficial to society
D) the number of people in poll who were
against the new gun control legislation

26.

Select
the most appropriate statistical test for each of the following:

We examine a random sample of State College apartments to see on average how
much rent increases per unit increase of square footage:
A) 1 Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D) Two-sample t-test with a one-sided
alternative
E) Two-sample t-test with a two-sided
alternative
F) Chi-square test
G) One-Way ANOVA test
H)
Regression

27.

Select
the most appropriate statistical test for each of the following:

We take random samples of African-American, White, Asian, and Hispanic workers
to determine if mean earnings differ among these groups:
A) 1 Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D) Two-sample t-test with a one-sided
alternative
E) Two-sample t-test with a two-sided
alternative
F) Chi-square test
G) One-Way
ANOVA test
H) Regression

28.

Select
the most appropriate statistical test for each of the following:

We want to test for a relationship between race and employment status (employed
or unemployed):
A) 1 Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D) Two-sample t-test with a one-sided
alternative
E) Two-sample t-test with a two-sided
alternative
F)
Chi-square test
G) One-Way ANOVA test
H) Regression

29.

Select
the most appropriate statistical test for each of the following:

We want to test if men have a higher salary than women in the field of
engineering using a random sample of male engineers and a random sample of
female engineers.
A) 1 Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D)
Two-sample t-test with a one-sided alternative.
E) Two-sample t-test with a two-sided
alternative.
F) Chi-square test
G) One-Way ANOVA test
H) Regression

30.

Select
the most appropriate statistical test for each of the following:

We want to test if more than 50% of children get a cold each Winter.
A) 1
Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D) Two-sample t-test with a one-sided
alternative
E) Two-sample t-test with a two-sided
alternative
F) Chi-square test
G) One-Way ANOVA test
H) Regression

31.

Select
the most appropriate statistical test for each of the following:

A researcher wants to see if female Caucasians are more likely to have blue
eyes than male Caucasians. What hypothesis test should be used?
A) One population proportion
B)
Difference between two population proportions
C) One population mean
D) Population mean difference (paired data)
E) Difference between two population means
(independent data)

32.

Select
the most appropriate statistical test for each of the following:

We survey a random sample of households in Philadelphia to test if less than
50% of families are families where both parents are working full time.
A) T-test about a mean with a one-sided
alternative
B) T-test about a mean with a two-sided
alternative
C) Chi-square test of independence
D) Z-test
about a proportion with a one-sided alternative
E) Z-test about a proportion with a two-sided
alternative
F) One-way Analysis of Variance (ANOVA)
G) Regression

33.

Select
the most appropriate statistical test for each of the following:

We test if the mean rent of all downtown Pittsburgh one bedroom apartments is
different from the mean rent of all non-downtown one bedroom apartments by
examining a random sample of downtown one-bedroom apartments and a random
sample of non-downtown one-bedroom apartments.
A) 1 Proportion Test
B) 1 mean test with a one-sided alternative
C) 1 mean test with a two-sided alternative
D) Two-sample t-test with a one-sided
alternative
E)
Two-sample t-test with a two-sided alternative
F) Chi-square test
G) One-Way ANOVA test
H) Regression

34.

Select
the proper NULL hypothesis:

Fifty students have their blood pressures before and after an exam. We wish to
know if there is an increase, on average.
A) H0:pd = 0
B) H0:p-hat1 – p-hat2
= 0
C) H0:?d
= 0
D) H0:x-bar1 – x-bar2
= 0

35.

Select
the proper NULL hypothesis:

A class survey is used to compare the GPAs of male and female students.
A) H0:p1 – p2
= 0
B) H0:p-hat1 – p-hat2
= 0
C) H0:?1
– ?2 = 0
D) H0:x-bar1 – x-bar2
= 0

36.

Select
the proper NULL hypothesis:

A study was conducted to see if there is a difference between blood pressures
of husbands and their wives.
A) H0:pd =
0
B) H0:p-hat1 – p-hat2 = 0
C) H0:µd = 0
D) H0:x-bar1 – x-bar2 = 0

37.

Identify
whether the comparison is based on two independent samples or paired data:

In a nationwide survey, people are asked if they think crime is a problem in
their town or not. The proportion saying yes is compared for people from large
cities versus people in small towns and rural areas.
A)
Independent
B) Paired

38.

Identify
whether the comparison is based on two independent samples or paired data:

Fifty students have their blood pressures before and after an exam. We wish to
know if there is an increase, on average.
A) Independent
B) Paired

39.

A
statistics class has 4 teaching assistants (TAs): three female assistants
(Lauren, Rona, and Leila) and one male assistant (Josh). Each TA teaches one
discussion section. A student picks a discussion section. The two events W =
{the TA is a woman} and J = {the TA is Josh} are
A) independent events.
B) mutually
exclusive events.
C) each simple events.
D) None of the above.

40.

Three
people are selected randomly one at a time from a group of 10 people as
representatives of the group. The group consists of 3 female and 7 male. What
is the probability for the three people selected to consist of (by order of
selection): Female, Female, Male.
A) 0.809524
B) 0.97619
C) 0.015873
D) 0.0583

41.

Which
one of the following statements is true?
A)
Increasing the sample size of a survey decreases the margin of error.
B) Increasing the sample size of a survey
increases the margin of error.
C) Increasing the sample size of a survey
decreases the impact of response bias.
D) Increasing the sample size of a survey
increases the impact of response bias.

42.

In
order to test if a coin is a fair coin, the coin is tossed 100 times and the
results (Head or Tail) were recorded for analysis. What is the sample in this
study?
A) the coin
B) the
outcomes of the 100 tosses
C) probability of the coin to show Head
D) percentage of Heads in the 100 outcomes

43.

Which
of the following is NOT part of the 5-number summary?
A) Mean
B) Median
C) Maximum
D) Minimum
E) All of choices are part of the 5-number
summary.

44.

Exams
scores (in percentages) range from 0 to 100. Suppose an exam for STAT 200 was
easy and most of the students scored very well with only a few students scoring
low. Which would best describe the shape of the distribution?
A) Right skewed
B) Left
skewed
C) Bell-shaped
D) Not enough information to tell

45.

A
student does not study for a 10 question multiple choice quiz, with five answer
choices for each question, so he randomly guesses an answer for every question.
Which choice below describes how to find the probability that this student gets
exactly 7 questions correct?
A) Find cumulative probability for 7 successes
for a binomial variable with n = 10 and p = 7/10.
B) Find cumulative probability for 7 successes
for a binomial variable with n = 10 and p = 1/5.
C) Find
probability of 7 successes for a binomial variable with n = 10 and p = 1/5
D) Find probability of 7 successes for a
binomial variable with n = 10 and p = 7/10

46.

Correctly
identify whether the following situations satisfy the conditions required to
conduct a Binomial experiment. Rolling a die many times and observing whether
the number obtained is even or odd
A) Binomial
B) NOT Binomial

47.

Suppose
that for X = net amount won or lost in a lottery game, the expected value is
E(X) = -$0.50. What is the correct interpretation of this value?
A) The most likely outcome of a single play is
a net loss of 50 cents.
B) A player will have a net loss of 50 cents
every single time he or she plays this lottery game.
C) Over a
large number of plays the average outcome for plays is a net loss of 50 cents.
D) A mistake must have been made because it’s
impossible for an expected value to be negative

48.

Suppose
that X=number of heads out of 12 independent flips of a fair coin. What is the
expected value of x?
A) 6
B) 12
C) 5
D) 3

49.

The
purpose of having a control group in a study is
A) to
estimate the response when the treatment is not applied.
B) to decrease the margin of error.
C) to be able to blind the subjects.
D) to make the samples more representative.

50.

Randomly
chosen 988 American adults participated in a poll regarding whether to approve
a new gun control legislation. What is the parmaeter of interest in this study?

A) the
proportion of American adults who approve the new gun control legislation
B) the proportion of the 988 people who
approve the the new gun control legislation
C) Is the new gun control legislation
beneficial to society
D) the number of people in poll who were
against the new gun control legislation

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