Question

We know that a confidence interval for a population proportion is (0.22,0.40), with a margin of error of 0.09.

What is the sample proportion, p ?

Answer 1

It will be 0.31.

P + 0.09 = 0.40
P - 0.09 = 0.22
Then P would equal 0.31 as 0.09 + 0.22 = 0.31, hope this helps :)) have a good day !