1. The width of a confidence interval estimate for a proportion will be:
a. narrower for 90% confidence than for 95% confidence.
b. wider for a sample size of 100 than for a sample size of 50.
c. narrower for 99% confidence than for 95% confidence.
d. narrower when the sample proportion if 0.50 than when the sample proportion is 0.20.
2. When determining the sample size needed for a proportion for a given level of confidence and sampling error, the closer to 0.50 that p is estimated to be:
a. the smaller the sample size required.
b. the larger the sample size required.
c. the sample size is not affected.
d. the effect cannot be determined from the information given.
3. Which of the following would be an appropriate alternative hypothesis?
a. The population proportion is less than 0.65.
b. The sample proportion is less than 0.65.
c. The population proportion is equal to 0.65.
d. The sample proportion is equal to 0.65.
4. Which of the following would be an appropriate null hypothesis?
a. The population proportion is equal to 0.60.
b. The sample proportion is equal to 0.60.
c. The population proportion is not equal to 0.60.
d. All of these choices are true.
Expected Responses Responses Blue-collar workers White-collar workers Managers For Against p =
1. The width of a confidence interval estimate for a proportion will be: a. narrower for 90% confidence than for 95% confidence. b. wider for a sample size of 100 than for a sample size of 50. c. narrower for 99% confidence than for 95% confidence. d. narrower when the sample proportion if 0.50 than when the sample proportion is 0.20. 2. When determining the sample size needed for a proportion for a given level of confidence and sampling error, the closer to 0.50 that p is estimated to be: a. the smaller the sample size required. b. the larger the sample size required. c. the sample size is not affected. d. the effect cannot be determined from the information given. 3. Which of the following would be an appropriate alternative hypothesis? a. The population proportion is less than 0.65. b. The sample proportion is less than 0.65. c. The population proportion is equal to 0.65. d. The sample proportion is equal to 0.65. 4. Which of the following would be an appropriate null hypothesis? a. The population proportion is equal to 0.60. b. The sample proportion is equal to 0.60. c. The population proportion is not equal to 0.60. d. All of these choices are true. | |||||
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