# Statistical Techniques In Business And Economics 15th Edition By Lind – Test Bank

Chapter 11 Two-Sample Tests of Hypothesis Answer Key

True / False Questions

1. If the null hypothesis states that there is no difference between the mean income of males and the mean income of females, then the test is one-tailed.

FALSE

AACSB: Communication Abilities

Bloom’s: Comprehension

Difficulty: Easy

Learning Objective: 11-01 Test a hypothesis that two independent population means with known population standard deviations are equal.

Topic: Two-Sample Tests of Hypothesis: Independent Samples

2. If the null hypothesis states that there is no difference between the mean net income of retail stores in Chicago and New York City, then the test is two-tailed.

TRUE

AACSB: Communication Abilities

Bloom’s: Comprehension

Difficulty: Easy

Learning Objective: 11-01 Test a hypothesis that two independent population means with known population standard deviations are equal.

Topic: Two-Sample Tests of Hypothesis: Independent Samples

3. In testing the difference between two population proportions, we pool the two sample proportions to estimate the population proportion.

TRUE

AACSB: Communication Abilities

Bloom’s: Comprehension

Difficulty: Medium

Learning Objective: 11-02 Carry out a hypothesis test that two population proportions are equal.

Topic: Two-Sample Tests about Proportions

4. The pooled estimate of the proportion is found by dividing the total number of samples by the total number of successes.

FALSE

AACSB: Communication Abilities

Bloom’s: Comprehension

Difficulty: Medium

Learning Objective: 11-02 Carry out a hypothesis test that two population proportions are equal.

Topic: Two-Sample Tests about Proportions

5. If we are testing for the difference between two population proportions, it is assumed that the two populations are approximately normal and have equal variances.

FALSE

AACSB: Communication Abilities

Bloom’s: Comprehension

Difficulty: Easy

Learning Objective: 11-02 Carry out a hypothesis test that two population proportions are equal.

Topic: Two-Sample Tests about Proportions

6. When the standard deviations are equal but unknown, a test for the differences between two population means has n – 1 degrees of freedom.

FALSE

AACSB: Communication Abilities

Bloom’s: Comprehension

Difficulty: Easy

Learning Objective: 11-03 Conduct a test of a hypothesis that two independent population means are equal; assuming equal but unknown population standard deviations.

Topic: Comparing Population Means with Unknown, Equal Population Standard Deviations

7. If we are testing for the difference between two population means and assume that the two populations have equal but unknown standard deviations, the variances are pooled to compute the best estimated variance.

TRUE

AACSB: Communication Abilities

Bloom’s: Comprehension

Difficulty: Easy

Learning Objective: 11-03 Conduct a test of a hypothesis that two independent population means are equal; assuming equal but unknown population standard deviations.

Topic: Comparing Population Means with Unknown, Equal Population Standard Deviations

8. If we are testing for the difference between two population means and assume that the two populations have equal and unknown standard deviations, the degrees of freedom are computed as (n1)(n2) – 1.

FALSE

AACSB: Communication Abilities

Bloom’s: Comprehension

Difficulty: Easy

Learning Objective: 11-03 Conduct a test of a hypothesis that two independent population means are equal; assuming equal but unknown population standard deviations.

Topic: Comparing Population Means with Unknown, Equal Population Standard Deviations

9. If two independent samples of size 10 with unequal standard deviations are used to test the difference between the means, the degrees of freedom for a t-statistic are 18.

FALSE

AACSB: Communication Abilities

Bloom’s: Comprehension

Difficulty: Easy

Learning Objective: 11-04 Conduct a test of a hypothesis that two independent population means are equal; assuming unequal but unknown population standard deviations.

Topic: Comparing Population Means with Unknown, Unequal Population Standard Deviations

10. When independent samples, with unknown, unequal standard deviations, are used to test for differences in the means, we pool the sample variances.

FALSE

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