![]() Enter in the given information (number of successes and number of observations) and select "Confidence interval for p". P(X=_) ="half the value of alpha".Ĭonfidence intervals for Proportions: Open Statcrunch, click "Stat", "Proportion Stats", "One Sample", "with summary". Enter in the mean (0 if you're using the standard normal distribution) and the standard deviation (1 if you're using the standard normal distribution). Open statcrunch, click "Stat", "Calculators", and "Normal".
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