In a test for equality of two proportions,the sample proportions were p1 = 12/50 and p2 = 18/50.The pooled proportion is
A).20
B).24
C).36
D).30

Question

Quizplus · Accepted Answer

The formula for pooled proportion is:
Pooled proportion = (p1*n1 + p2*n2) / (n1 + n2)
where n1 and n2 are the sample sizes for two groups.
Here, n1 = n2 = 50
Therefore, the pooled proportion can be calculated as:
Pooled proportion = (12/50 * 50 + 18/50 * 50) / (50 + 50)
= (12 + 18) / 100
= 30 / 100
= 0.30
= 30%
Hence, the answer is D) 30.

In a Test for Equality of Two Proportions,the Sample Proportions