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Using the Wald Method, What Is the 95% Confidence Interval

Question 30

Multiple Choice

Using the Wald method, what is the 95% confidence interval for the proportion when there are 15 observed successes and 25 observed failures?

A) 0.240 < p < 0.540
B) 0.235 < p < 0.535
C) 0.230 < p < 0.530
D) 0.225 < p < 0.525

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