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The quality control manager at a light bulb factory needs to estimate the mean life of...

The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 104 hours. A random sample of 64 light bulbs indicated a sample mean life of 390 hours. Complete parts​ (a) through​ (d) below.

Construct a 99 % confidence interval estimate for the population mean life of light bulbs in this shipment.

c. Must you assume that the population light bulb life is normally​ distributed? Explain.

Math   Statistics-And-Probability   
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