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Question No.2388

The mean lifetime of electric light bulbs produced by a company-02388

Online Quiz This subjective question is related to the book/course vu mth718 Topics in Numerical Methods. It can also be found in vu mth718 Mid Term Solved Past Paper No. 11.

Question 1: The mean lifetime of electric light bulbs produced by a company has in the past been 1120 hours with a standard deviation of 125 hours. A sample of 8 electric bulbs recently chosen form a supply of newly manufactured bulbs showed a mean lifetime of 1070 hours. Test the hypothesis that mean lifetime of the bulbs has not changed using a level of significance of 0.05.
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