Brand A 42 30 39 28 29 Brand B 28 36 31 32 27 Brand C 24 36 28 28 33 Test Statistic: P-V alue: 95% Confidence Interval for each brand: Brand D 20 32 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? Reject/Fail to Reject:

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Important, need 95% confidence interval. 

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
42
30
39
28
29
Brand B
28
36
31
32
27
Brand C
24
36
28
28
33
Test Statistic:
P-Value:
95% Confidence Interval for each brand:
Brand D
20
32
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?
Reject/Fail to Reject:
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 42 30 39 28 29 Brand B 28 36 31 32 27 Brand C 24 36 28 28 33 Test Statistic: P-Value: 95% Confidence Interval for each brand: Brand D 20 32 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? Reject/Fail to Reject:
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