Finalnub

ridgefield Wrote:
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> i understand why you don't use the standard error,
> but why do you use 1.65 - isn't that for a 90% CI?

1.65 ~ 95%-Quantile of standard normal.

meaning 5% prob mass is to the right of 1.65.

and to the left of -1.65

meaning 90% is in between.

(so you get your 90%)