The upper limit of the 85% confidence interval for the population proportion p, given that n = 60 and = 0.20 is 0.274.

Question

The upper limit of the 85% confidence interval for the population proportion p, given that n = 60 and  = 0.20 is 0.274.

Quizplus · Accepted Answer

Since the upper limit of the 85% confidence interval for p is 0.274, this means that the estimated proportion of successes (p-hat) falls within the range of 0.20 to 0.274 with 85% confidence. Since the interval includes the point estimate of 0.20 and extends above it, we can be fairly confident that the true proportion of successes in the population is greater than 0.20, but we cannot say for certain whether it is greater than 0.274. Therefore, the statement is true and the answer is A.

The Upper Limit of the 85% Confidence Interval for the Population