The average weight of a sample of women who attended aerobics classes at the YMCA-YWCA was 130 pounds. A researcher constructed a confidence interval (using an alpha of 0.05) of ±3.45. Which of these pairs presents the lower and upper limits of the estimate?
A) 126.55 and 130.45
B) 126.55 and 133.45
C) 130.00 and 130.00
D) 130.00 and 133.45

Question

Quizplus · Accepted Answer

The confidence interval is constructed by adding and subtracting the margin of error (3.45) from the average weight (130 pounds), resulting in lower and upper limits of 126.55 and 133.45, respectively.

The Average Weight of a Sample of Women Who Attended