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The mean life of a sample of 9 light bulbs from a company A was observed to be 280 hours with a standard deviation of
The mean life of a sample of 9 light bulbs from a company A was observed to be 280
hours with a standard deviation of 20 hours. A second sample of 16 bulbs chosen from
another company B showed a mean life of 390 hours with a variance of 200 hours. Test
at 5% level of significance to see whether the mean life of the light bulbs from A is less
than that from B.
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