We like confidence intervals. The previous exercise compared significance tests about the proportion p of all students who would pass a competency Notes and Data Sources 519 test, based on data showing that either 906 or 907 of an SRS of 1000 students passed. Give the 95% confidence interval for p in both cases. The intervals make clear how uncertain we are about the true value of p and how little difference there is between the two sample outcomes.

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