Based on a sample of size 49, a 95% confidence interval for the mean score of all students, μ, on an aptitude test is from 59.2 to 64.8.Find the margin of error.
A)5.6
B)0.78
C)0.05
D)2.8
E)There is not enough information to find the margin of error.

Question

Quizplus · Accepted Answer

The margin of error is half the width of the confidence interval. The interval is from 59.2 to 64.8, so the width is 64.8 - 59.2 = 5.6. Half of that is 2.8.

Based on a Sample of Size 49, a 95% Confidence