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Posted: May 13th, 2018

STATISTICS Multiple Choice Questions Exam

1- El error de muestreo es: The sampling error is:a. Un parámetro poblacional A population parameterb. La diferencia entre el estadístico de la muestra y el parámetro de la población Thedifference between the sample statistic and the population parameterc. Siempre positivo Always positived. Igual a la media poblacional Equal to the population mean2- There is 4 samples of 40 individuals each one have been interviewed to find out how oftenthey visit a fast food restaurant in the week. The mean of each sample were 2.5, 3.4, 2.3, and3.0. If the population mean is 2.85 and standard deviation is 0.50 and assume that thepopulation is normally distributed.Se tienen 4 muestras de 40 individuos cada uno entrevistados para saber la frecuencia conque visitan un restaurante de comida rápida en la semana. Las medias de cada muestra fueron,2.5, 3.4, 2.3, y 3.0. Si la media de la población es de 2.85 y su desviación estándar es de .50 yasumimos que la población está distribuida normalmente.a) Find the sampling error of each simple: Hallar el error de muestreo de cada muestra:1)2)3)b) Find the standard error: Hallar el error estándar:5)Formula:Error of sampling: error de muestreo:Standard error:4)3- En resumen, mientras más grande es la muestra mayor es la aproximación de la distribuciónmuestral a la distribución normal. In short, the larger the sample, the larger is to approximatethe sampling distribution to the normal distribution.TrueFalse4- El teorema del límite central nos dice que la distribución de promedios de muestrasaleatorias tiende a ser normal aun cuando la forma de la población de observaciones de la queprocede no es normal. The central limit theorem tells us that the distribution of averages ofaleatory/random samples tends to be normal even though the shape of the population ofobservations from which proceed is not normal.TrueFalse5- La aproximación a la curva normal aumenta según aumenta el tamaño de la muestra, esto lodice el teorema del límite superior. The approximation to the normal curve increases as thesample size increase, this is the theorem of the upper/superior limit.TrueFalse6- Una población normal posee una media de 80 y una desviación estándar de 10. Ustedselecciona una muestra de 25. Calcule la probabilidad de que la media muestral: a) Sea entre80 y 76. A normal population has a mean of 80 and a standard deviation of 10. You select asample of 25 Find the probability that the sample mean is between 80 and 76.7-¿Cuál de los siguientes enunciados son ciertos con respecto a los intervalos de confianzason correctos? Which of the following statements are true with respect to the confidenceintervals are correct?a.No tienen números negativos Don’t have negative numbersb.Siempre se basan con la distribución de z Always based distribution with zc.Siempre deben incluir el parámetro de la poblacional Must include the population parameterd.Ninguno de los enunciados son correctos. Neither one are correct8- Se tiene la siguiente información, se sabe mediante una encuesta realizada en 10 pueblosdel área sur de Puerto Rico que el tiempo medio de ver televisión al día es de 6.4.Investigaciones anteriores establecieron que la desviación estándar en los 10 pueblos fue de 1.La cantidad de entrevistados fue de 100 personas. Base on the following information is knownby a survey conducted in 10 cities in southern Mexico that the average television viewing timeper day is 6.4. Previous research established that the standard deviation in the 10 cities was 1.The number of respondents was 100 people.a) Identifique el estimador puntual Identify the point estimateb) Halle el intervalo de confianza para un 95%. Find the confidence interval for 95%c) Interprete los resultados Interpret the resultsFórmula:9- ¿Cuál de las siguientes variables nos indican el uso de la distribución t o z en un problemade intervalos de confianza? Which of the following variables indicate the use of the distribution tor z in a problem of confidence intervals?a. La desviación estándar de la población The standard deviation of the populationb.La desviación estándar de la muestra The standard deviation of the samplec. La media poblacional The population meand. La varianza de la población The variance of the population10-Un error tipo II se comete cuando: An error tipe II happens when:a.Se rechaza la hipótesis alternativa verdadera. A true alternative hypothesis is rejectedb.Se acepta la hipótesis nula falsa. False null hypothesis is acceptedc.Se rechaza una hipótesis nula verdadera. A true null hypothesis is rejectedd. Se acepta tanto la hipótesis nula y alternativa como verdadera. The null hypothesis and thealternative is accepted as true.11- La distribución t es más plana y se extiende más que la de z, se debe a que la desviaciónestándar de la distribución de t es mayor a la de la distribución de z. The t distribution is flat andextends over more than Z, it is because the standard deviation of the distribution of t is greaterthan the distribution of z.TrueFalse12- El primero en utilizar la distribución t fue: The first to use the t distribution was:a. Galileo Galileib. Carl Gaussc. Albert Einsteind. William Gosset13- Para que no se ignore el factor de corrección a la hora de halla el intervalo de confianza eltamaño de la muestra debe ser menor a: For the correction factor not to be ignored at the timeof found the confidence interval the sample size must be less than:a. 4%b. 5%c. 10%d. 3%14- Si establecen las siguientes hipótesis para las diferencias entre dos medias poblacionales,estas son: If you set the following hypotheses for differences between two population means,these are:H0: µ1=µ2H0: µ1?µ2a. Debe aplicar una prueba de una cola a la derecha You must apply a one-tailed test to therightb. Debe aplicar una prueba de dos colas You must apply one test of two tailsc. Debe aplicar una prueba de una cola a la izquierda You must apply a one-tailed test on theleftd. Ninguna de las anteriores Neither one of them15- La asociación de caficultores de Puerto Rico desea conocer el promedio libras de consumode café por semana en los pueblos del área metropolitana. En un estudio que se realizorecientemente el promedio de 81 personas entrevistadas fue de 1.5 libras a la semana y unadesviación estándar de 0 .10. The association of coffee growers in Colombia want to know theaverage pounds of coffee consumption per week in the towns of the metropolitan area. In astudy recently conducted an average of 81 respondents was 1.5 pounds per week and astandard deviation of 0 .10.1) ¿Cuál es el valor de la media poblacional? What is the value of the population mean?2) ¿Qué distribución utilizaremos en este problema, z o t? What distribution use in thisproblem, z or t?3) ¿Cuál es el valor de t para un intervalo de confianza de 95%? What is the value of t for aconfidence interval of 95%?4) Construya un intervalo de confianza de 95% para la media de la población. Construct aconfidence interval of 95% for the mean of the populationFormula:16) In the sentence, you are interested in the number of heads in launching 5 coins in the air,the experiment is:a. airb. 5 coins launch airc. number of headsd. the number of coins17) Each new employee of a department store is provided with an identification. Personnel filesare arranged in sequence starting with the number 0001 employee To poll employees abouttheir work shift, 0153. first chose the numbers 0253, 0353, 0453, were chosen so forth, becomesample members. Such sampling will receive name:a. simple random samplingb. stratified samplingc. systematic samplingd. cluster sampling18) The difference between the binomial and hypergeometric distributions is:a. number of resultsb. successes and failuresc. changes the probability of success in each triald. independence of events19) You divide a neighborhood blocks to survey political carcater. Then randomly select 12blocks and focuses its survey in these 12 blocks. Such sampling is:a. cluster samplingb. stratified samplingc. systematic samplingd. simple random sampling20) If the standard normal distribution is used, which of the following is the probability ofobtaining a z greater than 1.66?a. 0.99515b. 0.5000c. 0.0485d. 0.4515

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