Extreme Z-values for use in normal distribution
Extreme Z-values for use in normal distribution
(OP)
Hi all,
I did some calculations using the normal distribution curve and Z tables. Normally these calculation use Z-values between -3 and 3.
Are these calculations still reliable/applicable beyond a 99.9% confidence interval?
Cheers,
Alex
I did some calculations using the normal distribution curve and Z tables. Normally these calculation use Z-values between -3 and 3.
Are these calculations still reliable/applicable beyond a 99.9% confidence interval?
Cheers,
Alex
RE: Extreme Z-values for use in normal distribution
The problem you have is that you are calculating s from the sample you have. If you can assume a prioiri that your distribution is normal, then s defines the shape.
BUT... how do you know your distribution is normally distributed, especially at high Z values, unless you have the data to back it up?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?