Question

Suppose you are interested in determining the mean number of hours students spent working out each week. You want a 95% level of confidence and a maximum error of 0.25 hours. Assuming the standard deviation is 2.27 hours, what is the minimum number of students you must include in your sample? You must show a filled-out formula.

Answer 1

Solution:

Given :

. Level of significance.

hours

hours population standard deviations.

To find the minimum number of students include in the sample that is to find sample size n

The sample size n can be determined by using the formula as

At

. From Z table

n= 316.72609

n= 317

The minimum number of students include in sample is 317.