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Why does the confidence interval of z.97= 2.17?
I realize Confidence Interval and regular z-score are two different things though I struggle to figure out why (I suspect it has something to do with CI is testing in between standard deviations and seems to only show up in probability cases?). Anyways my z chart shows the levels of confidence for c, but it only shows for like 80, 90, 95, and 99%.
I know that if I were to solve for just the z score at 97% I would get 1.88. But, how do I solve for the Zc score at .97? and why is it 2.17? is it because that is how many standard deviations it is in each direction? Thanks
