(a) Are the lives of these brands of batteries different? (b) Analyze the residuals from this experiment. (c) Construct a 95 percent confidence interval estimate on the mean life of battery brand 2. Construct a 99 per- cent confidence interval estimate on the mean differ- ence between the lives of battery brands 2 and 3.
(a) Are the lives of these brands of batteries different? (b) Analyze the residuals from this experiment. (c) Construct a 95 percent confidence interval estimate on the mean life of battery brand 2. Construct a 99 per- cent confidence interval estimate on the mean differ- ence between the lives of battery brands 2 and 3.
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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Transcribed Image Text:3.26. Three brands of batteries are under study. It is suspect-
ed that the lives (in weeks) of the three brands are different.
Five randomly selected batteries of each brand are tested with
the following results:
Brand 1
100
96
92
96
92
Weeks of Life
Brand 2
76
80
75
84
82
Brand 3
108
100
96
98
100
Transcribed Image Text:(a) Are the lives of these brands of batteries different?
(b) Analyze the residuals from this experiment.
(c) Construct a 95 percent confidence interval estimate on
the mean life of battery brand 2. Construct a 99 per-
cent confidence interval estimate on the mean differ-
ence between the lives of battery brands 2 and 3.
(d) Which brand would you select for use? If the manu-
facturer 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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