Question

Suppose the 95% confidence interval for a population mean is (20.5, 35.5). What is the margin of error?

A) 7.5
B) 8.0
C) 14.5
D) 15.0

Answer 1

The margin of error for a confidence interval is half of the length of the interval. In this case, the margin of error is 7.5 units.

Step-by-step explanation:

The margin of error for a confidence interval is half of the length of the interval. In this case, the confidence interval is (20.5, 35.5), so the length of the interval is 35.5 - 20.5 = 15 units. Therefore, the margin of error is 15/2 = 7.5 units.