Question 9 of 25
A $90 \%$ confidence interval for a proportion is found to be $(0.52,0.58)$. What is the sample proportion?
A. 0.54
B. 0.55
C. 0.56
D. 0.58

Answer

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Answer

The sample proportion is: $\boxed{0.55}$

Steps

Step 1 ：Find the midpoint of the confidence interval: $\frac{0.52 + 0.58}{2}$

Step 2 ：Calculate the midpoint: $\frac{1.1}{2} = 0.55$

Step 3 ：The sample proportion is: $\boxed{0.55}$