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the quality control manager at a compact fluorescent light bulb factory needs to determine whether the...

the quality control manager at a compact fluorescent light bulb factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7506 hours. the population standard deviation is 900 hours. a random sample of 81 light bulbs indicates a sample mean life of 7256 hours

A at the 0.05 level of significance, is there evidence that the mean life is different from 7506 hours

B compute the p value and interpret its meaning

C construct a 95% confidence interval estimate of the population mean life of the light bulbs

D compare the results of A and C what conclusions do you reach?

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