Question

A 90% confidence interval for a proportion is found to be (0.52, 0.58) . What is the sample proportion?

Answer 1

Answer: Choice A) 0.55

Step-by-step explanation:

For the confidence interval (a,b), the midpoint is c = (a+b)/2

This midpoint is the sample proportion. This is because the confidence interval is built around this center point.

The midpoint of the interval (0.52, 0.58) is (0.52+0.58)/2 = 0.55