4-of-a-Kind
Join Date: Mar 2005
Location: Your place or my place
Posts: 3,610
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Yeah, thats pretty much right. Its not vital, but theres no reason not to change it and increase accuracy
Basically, to get a z-score you take your percentage of confidence wanted (as a decimal) and subtract it from 1. so 1-.95 = .05, look that up on a ztable and it corrosponds to 1.96 (95% is basically used all the time, so everyones memorized it). You could do 99% the same way, just google a z table and do 1-.99 = .01, and look up .01
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