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Question: The life in hours of a 75-watt light bulb is known to be approximately normally distributed, with standard deviation = 25 hours. A random

Question: The life in hours of a 75-watt light bulb is known to be approximately normally distributed, with

standard deviation = 25 hours. A random sample of 20 bulbs has a mean life of xbar = 1014

hours.

(a) Is there evidence to support the claim that the bulb life exceeds 1000 hours?

Use = 0.05.

(b) What is the P-value for the test in part (a)? What conclusion you could make

considering the P-value?

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