A company has 189 accountants. In a random sample of 50 of
them, the average number...
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A company has 189 accountants. In a random sample of 50 ofthem, the average number of overtime hours worked in a week was 9.7and the sample standard deviation was 6.2 hours.
a) Find a 95% confidence interval of the average number ofovertime hours worked by each accountant in this company duringthat week.
b) Find a 99% confidence interval of the total number ofovertime hours worked by each accountant in this company duringthat week.
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Solution Given thatsample size n 50Degrees of freedom df n 1 50 1 49at2df
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