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Question(s) / Instruction(s):

A manufacturer claims that they mean the lifetime of its fluorescent bulbs is 1000 hours a homeowner selects 40 bulbs and finds the mean lifetime to be 990 hours with a standard deviation of 80 hours. Test the manufacturers claim. Use a = 0.01

a. State Hypothesis and Identify Claim.
b. Identify level of significance.
c. Choose correct probability distribution, locate critical values identify rejection region.
d. Calculate test statistic.
e. Make decision
f. Write conclusion.
SHOW ALL YOUR WORK

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