Which of the following assumptions must be true in order to use the formula $\bar { x } \pm z _ {\alpha / 2 } \sigma / \sqrt { n }$ to find a confidence interval estimate of the population mean? $\begin{array}{|l|l|}
\hline A&\text {The population variance is known. }\
\hline B&\text { The population mean is known.}\
\hline C&\text { The population is normally distributed.}\
\hline D&\text {The confidence level is greater than $ 90 \% $. }\
\hline
\end{array}$

Question

Which of the following assumptions must be true in order to use the formula $\bar { x } \pm z _ {\alpha / 2 } \sigma / \sqrt { n }$ to find a confidence interval estimate of the population mean? $\begin{array}{|l|l|}
\hline  A&\text {The population variance is known. }\
\hline  B&\text { The population mean is known.}\
\hline  C&\text { The population is normally distributed.}\
\hline  D&\text {The confidence level is greater than $ 90 \% $. }\
\hline 
\end{array}$

Quizplus · Accepted Answer

The Answer of Which of the following assumptions must be true in order to use the formula $\bar { x } \pm z _ {\alpha / 2 } \sigma / \sqrt { n }$ to find a confidence interval estimate of the population mean? $\begin{array}{|l|l|}
\hline  A&\text {The population variance is known. }\
\hline  B&\text { The population mean is known.}\
\hline  C&\text { The population is normally distributed.}\
\hline  D&\text {The confidence level is greater than $ 90 \% $. }\
\hline 
\end{array}$

Which of the Following Assumptions Must Be True in Order xˉ±zα/2σ/n\bar { x } \pm z _ {\alpha / 2 } \sigma / \sqrt { n }xˉ±zα/2​σ/n​

Which of the Following Assumptions Must Be True in Order $\bar { x } \pm z _ {\alpha / 2 } \sigma / \sqrt { n }$