Unformatted text preview: error.
E. Both a Type I error and a Type II error. 1822 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. Chisquare statistic
E. None of the above 1823 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. Chisquare
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. Chisquare
E. None of the above 1824 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. Chisquare
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 pricetoearnings ratio in the consumer industry is higher than average pricetoearnings 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. 1825 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. Chisquare
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 1826 Chapter 01  An Introduction to...
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