A sample of size 300 had 96 successes. The lower limit of the 99% confidence interval for the population proportion is:
A) 0.3728.
B) 0.2672.
C) 0.2506.
D) 0.3894.

Question

Quizplus · Accepted Answer

The sample proportion is 96/300 = 0.32. Using the formula for the confidence interval for a proportion and the z-value for 99% confidence (2.576), the lower limit is calculated as 0.32 - 2.576 * sqrt((0.32*(1-0.32))/300) = 0.2506.

A Sample of Size 300 Had 96 Successes