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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
Related questions
Question
Three brands of batteries are under study. It is suspected that the lives (in weeks) of the three brands are different. Five randomly selected batteries of each brand are tested with the following results:
|
Weeks of Life |
||
|
Brand 1 |
Brand 2 |
Brand 3 |
|
100 |
76 |
108 |
|
96 |
80 |
100 |
|
92 |
75 |
96 |
|
96 |
84 |
98 |
|
92 |
82 |
100 |
(a) Use the modified Levene test to determine if the assumption of equal variances is satisfied. Use α = 0.05. Did you reach the same conclusion regarding the equality of variances by examining the residual plots?
(b) Which brand would you select for use? If the manufacturer will replace without charge any battery that fails in less than 85 weeks, what percentage would the company expect to replace?
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