Deck 29: Sampling From Finite Populations

Question 1

TABLE 7-8
According to a survey,only 15% of customers who visited the website of a major retail store made a purchase.Random samples of size 50 are selected from a population of 900.Use the finite population correction factor.
Referring to Table 7-8,what proportion of the samples will have between 20% and 30% of customers who will make a purchase after visiting the website?

Answer 1

0.1531

Question 2

TABLE 7-7
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours.A random sample of 4 students was taken from a population of 50 in order to estimate the mean study time for the population of all students.Use the finite population correction.
Referring to Table 7-7,80% of all the samples of 4 will have a sample mean of no more than how many hours from the population mean?

Answer 2

4.9668

Question 3

TABLE 7-8
According to a survey,only 15% of customers who visited the website of a major retail store made a purchase.Random samples of size 50 are selected from a population of 900.Use the finite population correction factor.
Referring to Table 7-8,what is the probability that a random sample of 50 will have at least 30% of customers who will make a purchase after visiting the website?

Answer 3

0.0011

Question 4

TABLE 7-7
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours.A random sample of 4 students was taken from a population of 50 in order to estimate the mean study time for the population of all students.Use the finite population correction.
Referring to Table 7-7,what is the probability that the sample mean differs from the population mean by more than 3 hours?

Question 5

TABLE 7-7
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours.A random sample of 4 students was taken from a population of 50 in order to estimate the mean study time for the population of all students.Use the finite population correction.
Referring to Table 7-7,90% of all the samples of 4 will have a sample mean of no more than how many hours from the population mean?

Question 6

TABLE 7-7
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours.A random sample of 4 students was taken from a population of 50 in order to estimate the mean study time for the population of all students.Use the finite population correction.
Referring to Table 7-7,what is the probability that the sample mean exceeds the population mean by more than 2 hours?

Question 7

The use of the finite population correction factor when sampling without replacement from finite populations will

A)increase the standard error of the mean.
B)not affect the standard error of the mean.
C)reduce the standard error of the mean.
D)only affect the proportion,not the mean.

Question 8

TABLE 7-8
According to a survey,only 15% of customers who visited the website of a major retail store made a purchase.Random samples of size 50 are selected from a population of 900.Use the finite population correction factor.
Referring to Table 7-8,90% of the samples will have more than what percentage of customers who will make a purchase after visiting the website?

Question 9

TABLE 7-7
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours.A random sample of 4 students was taken from a population of 50 in order to estimate the mean study time for the population of all students.Use the finite population correction.
Referring to Table 7-7,what is the probability that the sample mean is more than 3 hours below the population mean?

Question 10

TABLE 7-8
According to a survey,only 15% of customers who visited the website of a major retail store made a purchase.Random samples of size 50 are selected from a population of 900.Use the finite population correction factor.
Referring to Table 7-8,the mean of all the sample proportions of 50 customers who will make a purchase after visiting the website is ________.

Question 11

TABLE 7-8
According to a survey,only 15% of customers who visited the website of a major retail store made a purchase.Random samples of size 50 are selected from a population of 900.Use the finite population correction factor.
Referring to Table 7-8,90% of the samples will have less than what percentage of customers who will make a purchase after visiting the website?

Question 12

The finite population correction factor is

A) .
B) .
C) .
D) .

Question 13

TABLE 7-8
According to a survey,only 15% of customers who visited the website of a major retail store made a purchase.Random samples of size 50 are selected from a population of 900.Use the finite population correction factor.
Referring to Table 7-8,what proportion of the samples will have less than 15% of customers who will make a purchase after visiting the website?

Question 14

TABLE 7-7
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours.A random sample of 4 students was taken from a population of 50 in order to estimate the mean study time for the population of all students.Use the finite population correction.
Referring to Table 7-7,10% of all the samples of 4 will have a sample mean of at least how many hours below the population mean?

Question 15

TABLE 7-7
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours.A random sample of 4 students was taken from a population of 50 in order to estimate the mean study time for the population of all students.Use the finite population correction.
Referring to Table 7-7,what is the standard error of all the sample means?

Question 16

TABLE 7-8
According to a survey,only 15% of customers who visited the website of a major retail store made a purchase.Random samples of size 50 are selected from a population of 900.Use the finite population correction factor.
True or False: Referring to Table 7-8,the requirements for using a normal distribution to approximate a binomial distribution is fulfilled.

Question 17

You use the finite population correction factor when

A)you sample without replacement and the sample size is larger than 5% of the population size.
B)you sample without replacement and the sample size is smaller than 5% of the population size.
C)you sample with replacement and the sample size is larger than 5% of the population size.
D)you sample with replacement and the sample size is smaller than 5% of the population size.

Question 18

TABLE 7-8
According to a survey,only 15% of customers who visited the website of a major retail store made a purchase.Random samples of size 50 are selected from a population of 900.Use the finite population correction factor.
Referring to Table 7-8,the standard error of all the sample proportions of customers who will make a purchase after visiting the website is ________.

Question 19

TABLE 7-7
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours.A random sample of 4 students was taken from a population of 50 in order to estimate the mean study time for the population of all students.Use the finite population correction.
Referring to Table 7-7,what is the probability that the sample mean differs from the population mean by less than 2 hours?

Question 20

TABLE 7-7
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours.A random sample of 4 students was taken from a population of 50 in order to estimate the mean study time for the population of all students.Use the finite population correction.
Referring to Table 7-7,5% of all the samples of 4 will have a sample mean of at least how many hours above the population mean?