Choose the one alternative that best completes the statement or answers the question.
-The margin of error of a confidence interval is
A) $\pm z _ { \alpha / 2 } \frac { \sigma } { \sqrt { n } }$
B) $\mathrm { z } _ { \alpha / 2 }$
C) $\bar { x }$
D) $\frac { \sigma } { \sqrt { n } }$

Question

Quizplus · Accepted Answer

The margin of error of a confidence interval is given by $\pm z _ { \alpha / 2 } \frac { \sigma } { \sqrt { n } }$, where $z _ { \alpha / 2 }$ is the critical value from the standard normal distribution, $\sigma$ is the population standard deviation, and $n$ is the sample size. This formula adjusts the critical value by the standard error of the mean to calculate the margin of error.

Choose the One Alternative That Best Completes the Statement or Answers