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A random sample of 10 students contains the following observations

A random sample of 10 students contains the following observations, in hours, for time spent studying in the week before final exams:

28 57 42 35 61 39 55 46 49 38

Assume that the population distribution is normal.

a. Find the sample mean and standard deviation.

b. Test, at the 5% significance level, the null hypothesis that the population mean is 40 hours against the alternative that it is higher.

28 57 42 35 61 39 55 46 49 38

Assume that the population distribution is normal.

a. Find the sample mean and standard deviation.

b. Test, at the 5% significance level, the null hypothesis that the population mean is 40 hours against the alternative that it is higher.

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