1. The mean lifetime of electric bulbs produced by a company has in the past been 1120
hours with a S.D 125 hours. A sample of 100 bulbs recently chosen from a supply of newly
produced bulbs showed a mean lifetime of 1170 hours. Test the hypothesis that quality of
bulbs has been improved at 5% level of significance.
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hours with a S.D 125 hours. A sample of 100 bulbs recently chosen from a supply of newly
produced bulbs showed a mean lifetime of 1170 hours. Test the hypothesis that quality of
bulbs has been improved at 5% level of significance.
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