Emma is assigned the task of finding the mean number of hours students sleep per night....
Emma is assigned the task of finding the mean number of hours students sleep per night. Her results must be at a 99% level of confidence with a maximum error of 0.25 hours.
Assuming the standard deviation is 1.4 hours, how many students must Emma survey?
Homework Answers
Solution: We are given the confidence level is 0.99, the margin of error is 0.25 and the standard deviation is 1.4 hours.
Therefore, the number of students Emma must survey is:
Where:
is the critical value at the 0.01 significance level.
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