17:21. An investigation of the relative merits of two kinds of flashlight batteries showed that a k. klom sumple of 100 batteries of brand A lasted on the average 36:5 hours with a standard deviation of 1-8 hours, while a random sample of 80 batteries of brand B lasted on the average 36-8 hours with a standard deviation of 1-5 hours. Use a level of significance of 0-05 to test whether the observed difference between the average life times is significant.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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17:21. An investigation of the relative merits of two kinds of flashlight batteries showed that
a k. klom sumple of 100 batteries of brand A lasted on the average 36:5 hours with a standard deviation of
1-8 hours, while a random sample of 80 batteries of brand B lasted on the average 36-8 hours with a
standard deviation of 1:5 hours. Use a level of significance of 0:05 to test whether the observed difference
between the average life times is significant.
Transcribed Image Text:17:21. An investigation of the relative merits of two kinds of flashlight batteries showed that a k. klom sumple of 100 batteries of brand A lasted on the average 36:5 hours with a standard deviation of 1-8 hours, while a random sample of 80 batteries of brand B lasted on the average 36-8 hours with a standard deviation of 1:5 hours. Use a level of significance of 0:05 to test whether the observed difference between the average life times is significant.
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