BIG Corporation advertises that its light bulbs have a mean lifetime, μ , of 2900 hours. Suppose that we have reason to doubt this claim and decide to do a statistical test of the claim. We choose a random sample of light bulbs manufactured by BIG and find that the mean lifetime for this sample is 3040 hours and that the sample standard deviation of the lifetimes is 600 hours. Based on this information, answer the questions below. What are the null hypothesis ( H0 ) and the alternative hypothesis ( H1 ) that should be used for the test? H0 : μ is H1 : μ is In the context of this test, what is a Type II error? A Type II error is the hypothesis that μ is when, in fact, μ is . Suppose that we decide to reject the null hypothesis. What sort of error might we be making?

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