CALCULATION OF CONFIDENCE INTERVALS FOR POINT …

The z-score 1.96 is what specifies that this is a 95% confidence interval. Another z-score can be used to specify another level of confidence. Some z-scores are shown below. XX% Confidence Interval Z-Score 80% 1.28 90% 1.65 95% 1.96 99% 2.58 99.9% 3.29 7 Calculating Confidence Intervals when the data are not proportions ................
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