Answered: Four brands of flashlight batteries are…

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:Four brands of flashlight batteries are to be compared by testing each brand in five flashlights. Twenty flashlights are randomly selected and divided randomly into four groups of five flashlights each. Then each group of flashlights uses a different brand of battery. The lifetimes of the batteries, to the nearest hour, are as follows. Brand A Brand B Brand C Brand D 42 28 24 20 30 36 36 32 39 31 32 27 28 38 28 28 28 29 33 25 Preliminary data analyses indicate that the independent samples come from normal populations with equal standard deviations. At the 5% significance level, does there appear to be a difference in mean lifetime among the four brands of batteries? Let the subscripts 1, 2, 3, and 4 refer to Brand A, Brand B, Brand C, and Brand D, respectively. Each sample size is 5, and the total number of pieces of data is 20. CAMON 11 AI 16M AI Clear Selfie

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