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A sample of 40 teenagers showed that the average number of encounters with police was 1.8 with a standard deviation of 0.8. Past surveys have

A sample of 40 teenagers showed that the average number of encounters with police was 1.8 with a standard deviation of 0.8. Past surveys have found that the average number of encounters with police was lower, at 1.5. Test the hypothesis at the 0.01 level that the sample mean number of encounters with police is more than that of the population mean

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