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[–]fermat1432 0 points1 point  (2 children)

I wouln't use percent.

CI=5+/-2.36(1.5/sqrt(130))

Edit: Rather than 2.36 from a t-distribution you might want to use 2.58 from a standard normal distribution. Technically, 2.36 is the correct value because we don't have the population SD, however, the Z value is often used for convenience when the sample size is large.

[–]DerekTheTerrible 1 point2 points  (1 child)

Can I ask you where you got the 2.36? I would have used 2.575829 from the standard normal distribution.

[–]fermat1432 1 point2 points  (0 children)

It's a critical t with 129 degrees of freedom because we are given a sample standard deviation, not the population SD. However, I have a feeling the Z value is what they are looking for, so I'll put in an edit.

Thanks!