Question
A company claims that the mean battery life for their MP3 players is at least 30 hours. You suspect that this claim is incorrect -
A company claims that the mean battery life for their MP3 players is at least 30 hours.
You suspect that this claim is incorrect - to test the claim, you select a random sample of
18 MP3 players, and find that the sample has mean battery life is 28.5 hours, with a
standard deviation of 1.7 hours.
Based on this sample data, is there enough evidence at the = .01 significance level to
reject the manufacturer's claim?
a. No, because the test statistic is not in the rejection region.
b. Yes, because p = .0008 is less than the significance level.
c. No, because p = .0007 is greater than the test statistic.
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