Originally Posted by elo1412

Hi everyone,

I have installed Megastat 2013 add in to Excel 2013 32bit. I can't run any confidence interval at all.

1) When I try to run confidence interval for the mean, I have the following error:

"Probability must be between 0 and 1"

I used the following data:
Confidence interval - mean
mean = 400
Std Dev = 100
n = 800

2) When I try to run confidence interval for a proportion, I have the following error:

"Invalid or missing output"

I used the following data:
Confidence interval - p
p = 0.2
n = 50

I followed exactly the same instructions as my professor and I was the only student to have this problem.

Does anyone have a solution? Thanks in advance!