1 There is virtually no difference between tvalues and their

1. There is virtually no difference between t-values and their corresponding z-values when the sample size is greater than ________.

A. 120

B. 100

C. 30

D. 12

2. There is virtually no difference between t-values and their corresponding z-values when the sample size is greater than ________.

A. A Wall Street Journal poll reports that 45% - 48% of farmers produce grains

B. A New York Times survey states that more than 65% of American families own their own homes

C. A Gallup poll reports that 56% ± 3% of voters support candidate A

D. An editorial in Smart Money magazine states that the President is confident he will be re-elected

3. As the confidence interval becomes wider, the likelihood that the population mean ________.

A. will be contained in that interval decreases

B.will be in that interval is unchanged

C. will be contained in that interval increases

D. will be contained in that interval increases

4. The risk that the confidence interval does not contain the population mean can be reduced by ________.

A. decreasing the sample size

B.increasing the population size

C. increasing the sample size

D. decreasing the population size

5. A point estimate ________.

A. has a known measurement error

B. can be found by dividing the population parameter by the sample size

C. accurately estimates the population parameter

D. accurately estimates the population parameter

6. A major consumer products company wants to measure the quality of the packaging of their products on the store shelves. In a chain grocery store, all of the packages of a 15-ounce Wild Berry shampoo and all of the packages of a 4-ounce Man-O-Manly deodorant are sampled. What sampling method is being used for this sampling plan?

A. cluster sampling

B. simple random sampling

C. continuous sampling

D. protracted random sampling

Solution

1. There is virtually no difference between t-values and their corresponding z-values when the sample size is greater than _____30___.

2. There is virtually no difference between t-values and their corresponding z-values when the sample size is greater than ________. A Gallup poll reports that 56% ± 3% of voters support candidate A

3. As the confidence interval becomes wider, the likelihood that the population mean ________.

will be contained in that interval increases

4. The risk that the confidence interval does not contain the population mean can be reduced by ________. increasing the sample size

5. A point estimate ________. accurately estimates the population parameter

6. A major consumer products company wants to measure the quality of the packaging of their products on the store shelves. In a chain grocery store, all of the packages of a 15-ounce Wild Berry shampoo and all of the packages of a 4-ounce Man-O-Manly deodorant are sampled. What sampling method is being used for this sampling plan?

A. cluster sampling