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Various temperature measurements are recorded at different times for a particular city. The mean of 20C is obtained for 40 temperatures on 40 different days.

Various temperature measurements are recorded at different times for a particular city. The mean of 20C is obtained for 40 temperatures on 40 different days. Assuming that = 1.5C, test the claim that the population mean is 22C. Use a 0.05 significance level.

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