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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.

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.

Calculus For The Life Sciences
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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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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