The manufacturer of a particular brand of tires claims they average at least 50,000 miles before needing to be replaced. From past studies of this tire, it is known that the population standard deviation is 8,000 miles. A survey of tire owners was conducted. From the 23 tires surveyed, the mean lifespan was 40500 miles. Using alpha = 0.05, can we prove that the data is inconsistent with the manufacturers claim?   We should use a     test. What are the correct hypotheses? H0:                   Ha:                    Based on the hypotheses, find the following:Test Statistic=p-value= The correct decision is to       . The correct conclusion would be:

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