In Constructing a Confidence Interval for the Population Mean When $\bar { x } \pm t _ { a / 2 } \frac { s } { \sqrt { n } }$

question 108

Short Answer

In constructing a confidence interval for the population mean when the population variance is unknown, which of the following assumptions is required when using the following formula? $\bar { x } \pm t _ { a / 2 } \frac { s } { \sqrt { n } }$ $\begin{array}{|l|l|}\hline A&\text {The sample size is greater than 30 . }\\\hline B&\text {The population variance is known. }\\\hline C&\text { The population is normal.}\\\hline D&\text {The sample is drawn from a positively skewed distribution. }\\\hline \end{array}$

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Definitions:

Submucosa

A layer of dense irregular connective tissue or fibrous connective tissue that lies beneath a mucous membrane and supports it, often containing glands, blood vessels, and nerves.

Large Intestine

In vertebrates, the portion of the digestive tract that follows the small intestine. In humans, consists of the cecum, colon, rectum, and anal canal.

Duodenum

First part of the small intestine, where chyme enters from the stomach.

Peptidases

Enzymes that break down peptides into amino acids by cleaving the peptide bonds between amino acids.