A random sample of 20 observations taken from a normally distributed population revealed a sample mean of 65 and a sample variance of 16. The lower limit of a 90% confidence interval for the population mean would equal: $\begin{array}{|l|l|}
\hline A&\text {66.546 }\
\hline B&\text {63.454 }\
\hline C&\text {63.812 }\
\hline D&\text {66.188 }\
\hline
\end{array}$

Question

A random sample of 20 observations taken from a normally distributed population revealed a sample mean of 65 and a sample variance of 16. The lower limit of a 90% confidence interval for the population mean would equal: $\begin{array}{|l|l|}
\hline A&\text {66.546 }\
\hline B&\text {63.454 }\
\hline C&\text {63.812 }\
\hline D&\text {66.188  }\
\hline
\end{array}$

Quizplus · Accepted Answer

The Answer of A random sample of 20 observations taken from a normally distributed population revealed a sample mean of 65 and a sample variance of 16. The lower limit of a 90% confidence interval for the population mean would equal: $\begin{array}{|l|l|}
\hline A&\text {66.546 }\
\hline B&\text {63.454 }\
\hline C&\text {63.812 }\
\hline D&\text {66.188  }\
\hline
\end{array}$

A Random Sample of 20 Observations Taken from a Normally A66.546 B63.454 C63.812 D66.188 \begin{array}{|l|l|}\hline A&\text {66.546 }\\\hline B&\text {63.454 }\\\hline C&\text {63.812 }\\\hline D&\text {66.188 }\\\hline\end{array}ABCD​66.546 63.454 63.812 66.188 ​​

A Random Sample of 20 Observations Taken from a Normally $\begin{array}{|l|l|}\hline A&\text {66.546 }\\\hline B&\text {63.454 }\\\hline C&\text {63.812 }\\\hline D&\text {66.188 }\\\hline\end{array}$