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Posted: June 15th, 2022
What is the approximate standard deviation of
Study results indicate that the mean time to download a certain program to a personalcomputer is between 28.7 and 33.5 seconds.What is the study’s margin of error?Question 15 options:7.0 s4.8s3.5 s2.4 sMovie theater tickets in a region have a mean cost of $8.41 and a standard deviation of$0.82.What is the approximate standard deviation of the sampling distribution of the mean forsamples of size 50?Question 16 options:$0.12$0.17$0.10$0.02In a random sample of 60 people who rode a roller coaster one day, the mean wait time is42.4 minutes with a standard deviation of 8.8 minutes. In a random sample of 30 peoplewho rode a Ferris wheel the same day, the mean wait time is 12.7 minutes with a standarddeviation of 2.8 minutes.Which interval is the 99% confidence interval for the difference between the mean waittimes of everyone who rode both rides?Question 17 options:In a simple random sample of 80 patients who saw a certain dentist, 9 patients had theirteeth whitened.Which interval is the 95% confidence interval for the percent of all the dentist’s patients whohad their teeth whitened?Question 18 options:Which phrase is the best description of the association between variables X and Y?Question 19 options:weak positiveassociationstrong positive associationstrong negative associationweak negative associationQuestion 20 options:-2.522.5-2
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