A 90% confidence interval for a proportion is found to be (0.22, 0.28). What is the sample proportion?A.0.25B.0.28C.0.26D.0.24SUBMITarrow_backPREVIOUS
Question
A 90% confidence interval for a proportion is found to be (0.22, 0.28). What is the sample proportion?A.0.25B.0.28C.0.26D.0.24SUBMITarrow_backPREVIOUS
Solution
The sample proportion is the midpoint of the confidence interval. To find the midpoint, you add the two ends of the interval and divide by 2.
So, (0.22 + 0.28) / 2 = 0.25
Therefore, the sample proportion is 0.25. So, the answer is A. 0.25.
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