Answered: (a) Are the lives of these brands of…

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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