Based on a sample of 30 randomly selected years, a 90% confidence interval for the meanannual precipitation in one city is from 48.7 inches to 51.3 inches.Find the margin of error.
A)0.39 inches
B)0.10 inches
C)2.6 inches
D)1.3 inches
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 48.7 to 51.3, so the width is 51.3 - 48.7 = 2.6 inches. Half of this is 1.3 inches.

Based on a Sample of 30 Randomly Selected Years, a 90