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FALSE AACSB: Reflective Thinking
Bloom's: Analysis
Difficulty: Hard
Learning Objective: 2
Topic: Two independent population means 1863 Chapter 01  An Introduction to Business Statistics 16. When comparing two population means based on independent random samples, the
pooled estimate of the variance is used if both population standard deviations are known.
FALSE AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Hard
Learning Objective: 2
Topic: Two independent population means 17. Assume that we are constructing confidence interval for the difference in the means of
two populations based on independent random samples. If both sample sizes
and the distribution of both populations are highly skewed, then a confidence interval for the
difference in the means can be constructed using the t test statistic.
FALSE AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Hard
Learning Objective: 2
Topic: Two independent population means 18. If the limits of the confidence interval of the difference between the means of two
normally distributed populations were 8.5 and 11.5 at the 95% confidence level, then we can
conclude that we are 95% certain that there is a significant difference between the two
population means.
TRUE AACSB: Reflective Thinking
Bloom's: Evaluation
Difficulty: Hard
Learning Objective: 1
Topic: Two independent population means 1864 Chapter 01  An Introduction to Business Statistics 19. If the limits of the confidence interval of the difference between the means of two
normally distributed populations were from 2.6 and 1.4 at the 95% confidence level, then we
can conclude that we are 95% certain that there is a significant difference between the two
population means.
FALSE AACSB: Reflective Thinking
Bloom's: Evaluation
Difficulty: Hard
Learning Objective: 1
Topic: Two independent population means 20. When we are testing a hypothesis about the difference in two population proportions
based on large independent samples, we compute a combined (pooled) proportion from the
two samples if we assume that there is no difference between the two proportions in our null
hypothesis.
TRUE AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Learning Objective: 5
Topic: Two independent population proportions Multiple Choice Questions 21. In testing for the equality of variances from two independent populations, if the null
hypothesis is false, the test could result in:
A. A Type I error.
B. Either a Type I error or a Type II error.
C. Neither a Type I error or a Type II error.
D. A Type II error.
E. Both a Type I error and a Type II error. AACSB: Reflective Thinking
Bloom's: Evaluation
Difficulty: Medium
Learning Objective: 7
Topic: Two population variances 1865 Chapter 01  An Introduction to Business Statistics 22. In testing for the equality of means from two independent populations, if the null
hypothesis is rejected, the test could result in:
A. A Type I error.
B. Either a Type I error or a Type II error.
C. Neither a Type I error or a Type II error.
D. A Type II error.
E. Both a Type I error and a Type II error. AACSB: Reflective Thinking
Bloom's: Evaluation
Difficulty: Medium
Learning Objective: 1
Topic: Two independent population means 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 AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Hard
Learning Objective: 1
Topic: Two independent population means 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 AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Learning Objective: 5
Topic: Two independent population proportions 1866 Chapter 01  An Introduction to Business Statistics 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. AACSB: Reflective Thinking
Bloom's: Comprehension
Difficulty: Medium
Learning Objective: 4
Topic: Paired differences 26. In testing the difference between the means of two normally distributed populations using
large...
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 Winter '14

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