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Unformatted text preview: error. E. Both a Type I error and a Type II error. 1-822 Chapter 01 - An Introduction to Business Statistics 23. In testing for the equality of means from two independent populations, if the hypothesis of equal population means is rejected at α = .01, it will __________ be rejected at α = .05. A. Always B. Sometimes C. Never 24. A new company is in the process of evaluating its customer service. The company offers two types of sales: 1. Internet sales; 2. Store sales. The marketing research manager believes that the Internet sales are more than 10% higher than store sales. The null hypothesis would be: A. Pinternet- Pstore> .10 B. Pinternet- Pstore< .10 C. Pinternet- Pstore ≥ .10 D. Pinternet- Pstore ≤ .10 E. Pinternet- Pstore = .10 25. In order to test the effectiveness of a drug called XZR designed to reduce cholesterol levels, 9 heart patients' cholesterol levels are measured before they are given the drug. The same 9 patients use XZR for two continuous months. After two months of continuous use the 9 patients' cholesterol levels are measured again. The comparison of cholesterol levels before vs. after administering the drug is an example of testing the difference between: A. Two means from independent populations. B. Two population variances from independent populations. C. Two population proportions. D. Matched pairs from two dependent populations. 26. In testing the difference between the means of two normally distributed populations using large, independent random samples with known variances, the correct test statistic to use is: A. Z statistic B. t statistic C. F statistic D. Chi-square statistic E. None of the above 1-823 Chapter 01 - An Introduction to Business Statistics 27. A new company is in the process of evaluating its customer service. The company offers two types of sales: 1. Internet sales; 2. Store sales. The marketing research manager believes that the Internet sales are more than 10% higher than store sales. The alternative hypothesis for this problem would be stated as: A. Pinternet- Pstore> 0 B. Pinternet- Pstore< 0 C. Pinternet- Pstore ≥ 0 D. Pinternet- Pstore ≤ .10 E. Pinternet- Pstore > .10 28. If the Z statistic (critical value) is incorrectly used in lieu of the t statistic when comparing two means from independent populations using small samples, the chance of rejecting the null hypothesis __________. A. Increases B. Decreases C. Remains the same 29. When testing a hypothesis about the mean of a population of paired differences in which two different observations are taken on the same units, the correct test statistic to use is: A. Z B. t C. F D. Chi-square E. None of the above 30. When comparing the variances of two normally distributed populations using independent random samples, the correct test statistic to use is __________. A. Z B. t C. F D. Chi-square E. None of the above 1-824 Chapter 01 - An Introduction to Business Statistics 31. When testing the difference between two population proportions using large independent random samples, __________ test statistic is used. A. Z B. t C. F D. Chi-square E. None of the above 32. If the Z statistic (critical value) is incorrectly used in lieu of the t statistic when comparing two means from independent populations using small samples, the chance of committing a Type II error __________. A. Increases B. Decreases C. Remains the same 33. A financial analyst working for a financial consulting company wishes to find evidence that the average price-to-earnings ratio in the consumer industry is higher than average priceto-earnings ratio in banking industry. The alternative hypothesis is: A. µconsumer= µbanking B. µconsumer≤ µbanking C. µconsumer> µbanking D. µconsumer< µbanking E. µconsumer≠ µbanking 34. In testing the difference between two means from two normally distributed independent populations, the distribution of the difference in sample means will be: A. Normally distributed only if sample sizes are equal. B. Normally distributed only if both population standard deviations are known. C. Normally distributed. D. Normally distributed if both sample sizes are very large. E. Normally distributed only if both population variances are equal. 1-825 Chapter 01 - An Introduction to Business Statistics 35. In testing the difference between the means of two normally distributed populations using small independent random samples, the most appropriate test statistic is the _________ statistic. A. Z B. t C. F D. Chi-square E. None of the above 36. If we are testing the hypothesis about the mean of a population of paired differences with samples of n1 = 10, n2 = 10, the degrees of freedom for the t statistic is ____. A. 19 B. 18 C. 9 D. 8 E. 10 37. If we are testing the difference between the means of two normally distributed independent populations with samples of n1 = 10, n2 = 10, the degrees of freedom for the t statistic is ____. A. 19 B. 18 C. 9 D. 8 E. 20 1-826 Chapter 01 - An Introduction to...
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