I need help with a statistics problem

Statistics
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A university dean wishes to estimate the average number of hours his part-time instructors teach per week. The standard deviation is 2.6 hours. How large a sample must be selected if he wants to be 95% confident of finding whether the true mean differs from the sample mean by 1 hour?

Nov 6th, 2015

Thank you for the opportunity to help you with your question!

We have the formula as

d=standard deviation=2.6

MOE=margin of error =1

z =criitical value at the 95% confidence interval =1.96

Substitute the value and solve for n (sample size)

Thus the sample size is 26(answer)


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Nov 6th, 2015

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