The Basic Practice of Statistics
The Basic Practice of Statistics
8th Edition
ISBN: 9781319057916
Author: Moore
Publisher: MAC HIGHER
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Chapter 28, Problem 28.32CYS
To determine

To identify: The test used to compare the blood pressures of two groups.

Expert Solution & Answer
Check Mark

Answer to Problem 28.32CYS

Correct answer:

Option (a), Wilcoxon rank sum test.

Explanation of Solution

Reason for the correct answer:

Here, the blood pressure of eight high-capacity and eight low-capacity rats are compared. That is, the two samples are independent and they are compared. Hence, the Wilcoxon rank sum test is used.

Reason for the incorrect answer:

Option (b) and Option (c) are incorrect because the two independent samples are involved in the study. Hence, the Wilcoxon rank sum test is used

Conclusion:

Therefore, the correct option is (a).

Statistics Concept Introduction

Introduction:

The alternative method for the unpaired t-test is Wilcoxon rank sum test. The Wilcoxon rank sum test is also called the Mann-Whitney U test or the Wilcoxon-Mann-Whitney test.

The conditions required for this test are mentioned below:-

  • Two samples are independent and simple random sample from the two distinct populations.
  • Both the populations are continuous distribution.
  • The two populations have the distribution of the same shape.

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