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 flashlightseach. 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 C43 29 25 2029 35 35 3139 31 28 3828 32 28 2829 27 33 25Preliminary data analyses indicate that the independent samples come from normal populations withequal standard deviations. At the 5% significance level, does there appear to be a difference in meanlifetime among the four brands of batteries? Find the p − value. 6. 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 flashlightseach. Then each group of flashlights uses a different brand of battery. The lifetimes of the batteries,to the nearest hour, are as follows.Brand A4329392829Brand B2935313227Brand C2535282833Brand C2031382825Preliminary data analyses indicate that the independent samples come from normal populations withequal standard deviations. At the 5% significance level, does there appear to be a difference in meanlifetime among the four brands of batteries? Find the p - value.

The question is about ANOVA Given : To find : Does there appear to be diff. in mean lifetime…

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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Question

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 C
43 29 25 20
29 35 35 31
39 31 28 38
28 32 28 28
29 27 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? Find the p − value.

Transcribed Image Text:6. 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 43 29 39 28 29 Brand B 29 35 31 32 27 Brand C 25 35 28 28 33 Brand C 20 31 38 28 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? Find the p - value.

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