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State the hypotheses, the direction, the p-value, and decision

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The police chief of a large city claims that the mean age of bicycle thieves is 10.5 years. A sociologist who feels that this figure is too high takes a random sample of 28 cases of bicycle theft from the police chief's files, getting a mean of 8.9 years and a standard deviation of 3.2 years. Test the sociologist's hunch at the .01 significance level.

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The hypothesis, direction, value of p-values and conclusions are discussed.

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Ho: The mean age of bicycle thieves is 10.5 years
Ha: The mean age of bicycle ...

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