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If we want to construct a two-sided confidence interval, what is the critical value for a 99% confidence interval for a Z interval? Note: Round

If we want to construct a two-sided confidence interval, what is the critical value for a 99% confidence interval for a Z interval?

Note: Round to the nearest thousandth.

i came up with 1.645

I DID 100-99=1

answer was 2.576

critical value is the (1+p)/2 percentile from the standard normal distribution.

explain please

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