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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

the following data represent the breaking strengths of samples of 20 gauge insulated copper wire from three different suppliers. The researcher is interested in finding evidence that the distribution of breaking strength differs by supplier. Use the .01 significance level and the Kruskal-Wallis test to answer the following questions.

Supplier
A	B	C
150	157	143
154	161	147
156	163	151
161	166	154
162	170	156

Give the value of the Kruskal-Wallis test statistic for the above data.

What's the p-value?

What's the critical value?

What's the decision?

Expert Solution

Step 1

The breaking strengths of gauge insulated copper wire from three different suppliers are given as :

A	B	C
150	157	143
154	161	147
156	163	151
161	166	154
162	170	156

To use : The Kruskal-Wallis test (.01 significance level )

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