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A company claims that the mean battery life of their MP3 players at least 30 hours....

A company claims that the mean battery life of their MP3 players at least 30 hours. You suspect this claim is incorrect and find that a random sample of 18 MP3 players has a mean battery life of 28.5 hours and a standard deviation of 1.7 ours. Is there enough evidence to reject the claim at α=0.01?

  1. Find the standardized test statistics t






  1. Decide whether to reject or fail to reject the null hypothesis


Math   Statistics-And-Probability   
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