#### cyclonefb3

##### New member

- Joined
- Apr 8, 2008

- Messages
- 1

mean = 60

SD = 30

n=100

So I did this:

z = estimate - hypothesis 90 - 0

-------------------- --------- = 3

SD of estimate 30

z = 3

When you look on a normal table the z value at 3 = .9987

Does that mean there is 99% probability of this happening or am I doing this wrong?