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Statistics/mean and significance level

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It is commonly accepted that the mean temperature of humans is 98.6oF. The CEO of Au & Associates has nothing better to do but measured the temperatures of 26 department managers 1 to 4 times daily to get a total of 123 measurements. The collected data yielded a sample mean of 98.4oF and a sample standard deviation of 0.7oF. Is the mean temperature of the managers is less than 98.6oF at the 0.01 significance level? Justify your answer with the proper statistics.

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Statistics, means and significance level are determined.

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The mean temperature is M = 98.6
Number of observations is N = 123
Sample mean is X= 98.4
Standard deviation is SD = 0.7

We need to use a t-test to test if the mean temperature is below 98.6 F.
Ho: X ...

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