Question 1

A probability distribution of all possible values of a sample statistic is known as

Accepted Answer

A)  a sample statistic. 
B)  a parameter. 
C)  simple random sampling. 
D)  a sampling distribution. 
A)  a sample statistic. 
B)  a parameter. 
C)  simple random sampling. 
D)  a sampling distribution.

Question 2

Convenience sampling is an example of _____ sampling.

Accepted Answer

A)  probabilistic 
B)  stratified 
C)  nonprobabilistic 
D)  cluster 
A)  probabilistic 
B)  stratified 
C)  nonprobabilistic 
D)  cluster

Question 3

The probability distribution of all possible values of the sample mean   is

Accepted Answer

A)  the probability density function of   . 
B)  the sampling distribution of   . 
C)  the grand mean, since it considers all possible values of the sample mean. 
D)  one, since it considers all possible values of the sample mean. 
A)  the probability density function of   . 
B)  the sampling distribution of   . 
C)  the grand mean, since it considers all possible values of the sample mean. 
D)  one, since it considers all possible values of the sample mean.

Question 4

A sample of 66 observations will be taken from an infinite population. The population proportion equals 0.12. The probability that the sample proportion will be less than 0.1969 is

Accepted Answer

A)  0.0955. 
B)  0.9045. 
C)  0.0273. 
D)  0.9727. 
A)  0.0955. 
B)  0.9045. 
C)  0.0273. 
D)  0.9727.

Question 5

Which of the following sampling methods does not lead to probability samples?

Accepted Answer

A)  Stratified sampling 
B)  Cluster sampling 
C)  Systematic sampling 
D)  Convenience sampling 
A)  Stratified sampling 
B)  Cluster sampling 
C)  Systematic sampling 
D)  Convenience sampling

Question 6

The extent of the sampling error might be affected by all of the following factors except the

Accepted Answer

A)  variability of the population. 
B)  expected value of the sample statistic 
C)  sample size. 
D)  sampling method used. 
A)  variability of the population. 
B)  expected value of the sample statistic 
C)  sample size. 
D)  sampling method used.

Question 7

A probability sampling method in which we randomly select one of the first k elements and then select every kth element thereafter is _____ sampling.

Accepted Answer

A)  stratified random 
B)  cluster 
C)  systematic 
D)  convenience 
A)  stratified random 
B)  cluster 
C)  systematic 
D)  convenience

Question 8

Four hundred people were asked whether gun laws should be more stringent. Three hundred said "yes," and 100 said "no". The point estimate of the proportion in the population who will respond "no" is

Accepted Answer

A)  75. 
B)  0.25. 
C)  0.75. 
D)  0.50. 
A)  75. 
B)  0.25. 
C)  0.75. 
D)  0.50.

Question 9

The sampling error is the

Accepted Answer

A)  same as the standard error of the mean. 
B)  difference between the value of the sample mean and the value of the population mean. 
C)  error caused by selecting a bad sample. 
D)  standard deviation multiplied by the sample size. 
A)  same as the standard error of the mean. 
B)  difference between the value of the sample mean and the value of the population mean. 
C)  error caused by selecting a bad sample. 
D)  standard deviation multiplied by the sample size.

Question 10

Random samples of size 64 are taken from an infinite population whose mean and standard deviation are 240 and 16, respectively. The distribution of the population is unknown. The mean and the standard error of the mean are

Accepted Answer

A)  240 and 16. 
B)  64 and 16. 
C)  8 and 2. 
D)  240 and 2. 
A)  240 and 16. 
B)  64 and 16. 
C)  8 and 2. 
D)  240 and 2.

Question 11

Random samples of size 49 are taken from a population that has 200 elements, a mean of 180, and a variance of 196. The distribution of the population is unknown. The standard error of the mean is

Accepted Answer

A)  24.39. 
B)  28. 
C)  2. 
D)  1.74. 
A)  24.39. 
B)  28. 
C)  2. 
D)  1.74.

Question 12

In computing the standard error of the mean, the finite population correction factor is used when

Accepted Answer

A)  N/n > 0.05. 
B)  N/n   0.05. 
C)  n/N > 0.05. 
D)  n/N   30. 
A)  N/n > 0.05. 
B)  N/n   0.05. 
C)  n/N > 0.05. 
D)  n/N   30.

Question 13

The following data was collected from a simple random sample of a population.   The point estimate of the population mean

Accepted Answer

A)  cannot be determined, since the population size is unknown. 
B)  is 18.4. 
C)  is 18. 
D)  is 92. 
A)  cannot be determined, since the population size is unknown. 
B)  is 18.4. 
C)  is 18. 
D)  is 92.

Question 14

The following data was collected from a simple random sample of a population.   If the population consisted of 10 elements, how many different random samples of size 6 could be drawn from the population?

Accepted Answer

A)  2 
B)  50 
C)  252 
D)  30,240 
A)  2 
B)  50 
C)  252 
D)  30,240

Question 15

From a population of 500 elements, a sample of 225 elements is selected. It is known that the variance of the population is 900. The standard error of the mean is approximately

Accepted Answer

A)  1.1022. 
B)  2. 
C)  30. 
D)  1.4847. 
A)  1.1022. 
B)  2. 
C)  30. 
D)  1.4847.

Question 16

The standard deviation of a sample of 100 elements taken from a very large population is determined to be 60. The variance of the population

Accepted Answer

A)  cannot be larger than 60. 
B)  cannot be larger than 3600. 
C)  must be at least 100. 
D)  can be any value greater or equal to zero. 
A)  cannot be larger than 60. 
B)  cannot be larger than 3600. 
C)  must be at least 100. 
D)  can be any value greater or equal to zero.

Question 17

There are 7 children in a family. The number of children defines a population. The number of simple random samples of size 2 (without replacement) which are possible equals

Accepted Answer

A)  14. 
B)  21. 
C)  5. 
D)  42. 
A)  14. 
B)  21. 
C)  5. 
D)  42.

Question 18

In stratified random sampling,​

Accepted Answer

A)  ​randomly selected elements within each of the strata form the sample. 
B)  ​all elements within the randomly selected strata form the sample. 
C)  ​randomly selected elements within the randomly selected strata form the sample. 
D)  ​all elements within each of the strata form the sample. 
A)  ​randomly selected elements within each of the strata form the sample. 
B)  ​all elements within the randomly selected strata form the sample. 
C)  ​randomly selected elements within the randomly selected strata form the sample. 
D)  ​all elements within each of the strata form the sample.

Question 19

Which of the following is an example of nonprobabilistic sampling?

Accepted Answer

A)  Simple random sampling 
B)  Stratified simple random sampling 
C)  Cluster sampling 
D)  Judgment sampling 
A)  Simple random sampling 
B)  Stratified simple random sampling 
C)  Cluster sampling 
D)  Judgment sampling

Question 20

Random samples of size 64 are taken from an infinite population whose mean and standard deviation are 24 and 6.4, respectively. The distribution of the population is unknown. The mean and the standard error of the mean are

Accepted Answer

A)  64 and 6.4. 
B)  64 and 0.8. 
C)  24 and 6.4. 
D)  24 and 0.8. 
A)  64 and 6.4. 
B)  64 and 0.8. 
C)  24 and 6.4. 
D)  24 and 0.8.

Exam 7: Sampling and Sampling Distributions

A probability distribution of all possible values of a sample statistic is known as

Convenience sampling is an example of _____ sampling.

The probability distribution of all possible values of the sample mean is

A sample of 66 observations will be taken from an infinite population. The population proportion equals 0.12. The probability that the sample proportion will be less than 0.1969 is

Which of the following sampling methods does not lead to probability samples?

The extent of the sampling error might be affected by all of the following factors except the

A probability sampling method in which we randomly select one of the first k elements and then select every kth element thereafter is _____ sampling.

Four hundred people were asked whether gun laws should be more stringent. Three hundred said "yes," and 100 said "no". The point estimate of the proportion in the population who will respond "no" is

The sampling error is the

Random samples of size 64 are taken from an infinite population whose mean and standard deviation are 240 and 16, respectively. The distribution of the population is unknown. The mean and the standard error of the mean are

Random samples of size 49 are taken from a population that has 200 elements, a mean of 180, and a variance of 196. The distribution of the population is unknown. The standard error of the mean is

In computing the standard error of the mean, the finite population correction factor is used when

The following data was collected from a simple random sample of a population. The point estimate of the population mean

The following data was collected from a simple random sample of a population. If the population consisted of 10 elements, how many different random samples of size 6 could be drawn from the population?

From a population of 500 elements, a sample of 225 elements is selected. It is known that the variance of the population is 900. The standard error of the mean is approximately

The standard deviation of a sample of 100 elements taken from a very large population is determined to be 60. The variance of the population

There are 7 children in a family. The number of children defines a population. The number of simple random samples of size 2 (without replacement) which are possible equals

In stratified random sampling,​

Which of the following is an example of nonprobabilistic sampling?

Random samples of size 64 are taken from an infinite population whose mean and standard deviation are 24 and 6.4, respectively. The distribution of the population is unknown. The mean and the standard error of the mean are

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Tests of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Decision Analysis

Index Numbers

Statistical Methods for Quality Control

Sample Survey

Filters

A probability sampling method in which we randomly select one of the first k elements and then select every k^th element thereafter is _____ sampling.

In stratified random sampling,