# lecture11 - Co n f i dence Intervals CI = point es tima t e...

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C onfidence Intervals CI = point estimate ± margin of error Where margin of error = critical value x SE population point parameter estimate ± critical value x SE Sample Size Determination: whole number answer ____________________________________________________________________ | | Proportion Z = positive critical value: invNorm( 1 - α / 2 ) Mean α is area outside confidence interval Critical Values: Remember α is the area outside of the confidence area under the normal curve. Zcv: needed for Z-intervals and Sample Size determination Find the percentile at the upper boundary of the confidence area under the normal curve. α = 1.00 C-level (as a decimal) % tile = 1.0 α /2 Put percentile into invNorm( % tile ) and solve for Zcv , which tells you how many SD's away from center the CI boundary is located.
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