a. standard deviation c. sample size b. finite correction factor d. degrees of freedom It is known that the variance of a population equals 1,936. A random sample of 121 has been selected from the population. There is a .95 probability that the sample mean will provide a margin of error of _____. a. 31.36 or less c. 1,936 or less b. 344.96 or less d. 7.84 or less Chapter 9 For a two-tailed test with a sample size of 40, the null hypothesis will NOT be rejected at a 5% level of significance if the test statistic is _____. a. greater than 1.96 c. between –1.96 and 1.96, exclusively b. less than 1.645 d. greater than –1.645 In tests about a population proportion, p0 represents the _____. a. probability of p − p x c. observed sample proportion b. hypothesized population proportion d. observed p-value Which of the following is an improper form of the null and alternative hypotheses? a. H0: μ ≥ μ0 and Ha: μ < μ0 b. H0: μ < μ0 and Ha: μ ≥ μ0 c. H0: μ ≤ μ0 and Ha: μ > μ0 d. H0: μ = μ0 and Ha: μ ≠ μ0 A meteorologist stated that the average temperature during July in Chattanooga was 80 degrees. A sample of July temperatures over a 32-year period was taken. The correct set of hypotheses is _____. a. H0: μ < 80 Ha: μ ≤ 80 c. H0: μ = 80 Ha: μ ≠ 80 b. H0: μ ≠ 80 Ha: μ = 80 d. H0: μ ≤ 80 Ha: μ > 80 A student believes that the average grade on the final examination in statistics is at least 85. She plans on taking a sample to test her belief. The correct set of hypotheses is _____. a. H0: μ > 85 Ha: μ ≤ 85 c. H0: μ < 85 Ha: μ ≥ 85 b. H0: μ ≤ 85 Ha: μ > 85 d. H0: μ ≥ 85 Ha: μ < 85 The probability of making a Type I error is denoted by _____. a. β c. 1 − β b. α d. 1 – α The level of significance is the _____. a. maximum allowable probability of a Type I error c. maximum allowable probability of a Type II error b. same as the confidence coefficient d. same as the p-value In the hypothesis testing procedure, α is _____. a. the critical value c. 1 − level of significance b. the level of significance d. the confidence level
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