Use the confidence interval to find the margin of error and the sample mean. (12, 20)
A)E = 4, $\bar { x }$ = 16
B)E = 88, $\bar { x }$ = 16
C)E = 8, $\bar { x }$ = 12
D)E = 4, $\bar { x }$ = 20

Question

Quizplus · Accepted Answer

The margin of error (E) is half the width of the confidence interval, so $E = \frac{20 - 12}{2} = 4$. The sample mean ($\bar{x}$) is the midpoint of the interval, so $\bar{x} = \frac{20 + 12}{2} = 16$.

Use the Confidence Interval to Find the Margin of Error xˉ\bar { x }xˉ

Use the Confidence Interval to Find the Margin of Error $\bar { x }$