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2. The mean lifetime of electric light bulbs produced by a company has in the past been 1120h with a standard deviation of 125h. A sample of eight electric light bulhs recently chosen from a supply of newly produced bulbs showed a mcan lifetime of 1070 h. Test the hypothesis that the mean lifetime of the bulbs has not changed, using significance levels of (a) 0.05 and (h) 0.01.

2. The mean lifetime of electric light bulbs produced by a company has in the past been 1120h with a standard deviation of 125h. A sample of eight electric light bulhs recently chosen from a supply of newly produced bulbs showed a mcan lifetime of 1070 h. Test the hypothesis that the mean lifetime of the bulbs has not changed, using significance levels of (a) 0.05 and (h) 0.01.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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compute for the z or t value and decide whether to retain or reject the null hypothesis. provide an explanation for the decision

2. The mean lifetime of electric light bulbs produced by a company has in the past been 1120h with a standard deviation of 125h. A sample of eight electric light bulhs recently chosen from a supply of newly produced bulbs showed a mean lifetime of 1070 h. Test the hypothesis that the mean lifetime of the bulbs has not changed, using significance levels of (a) 0.05 and (h) 0.01.
Transcribed Image Text:2. The mean lifetime of electric light bulbs produced by a company has in the past been 1120h with a standard deviation of 125h. A sample of eight electric light bulhs recently chosen from a supply of newly produced bulbs showed a mean lifetime of 1070 h. Test the hypothesis that the mean lifetime of the bulbs has not changed, using significance levels of (a) 0.05 and (h) 0.01.
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