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A researcher is interested in the average time served in jail for robbery. They ...
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A researcher is interested in the average time served in jail for robbery. They take a sample of 400 convictions, and find the average time served is
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= 7.5 years, with standard deviation s = 3 years. Since the sample is so large, it is reasonable to believe that s is close to σ. A 95% confidence interval for the average time served in jail for robbery is:❌
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