MATH 227 STATISTICS FINAL EXAM - West Los Angeles College

EXTRA CREDIT: Sears claims that the “new and improved” batteries have mean lifetime which
is now greater than 17 months, but a leading consumer group thinks the lifetime is still 17 months
(or less).
So, the hypotheses are H 0 : µ = 17
H a ; µ > 17
a) Who is more likely to want a larger significance level, Sears or the consumer group
Explain.
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b) Suppose both parties decide on α = 0.05. A hypothesis test is conducted from sample
data, and the p-value = 0.03. What would be the conclusion to this hypothesis test
Why Explain in the context of the problem. Your explanation should be complete and
specific.
Ans. _____________________________________________________________
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