Use the Given Degree of Confidence and Sample Data to Find

question 137

Multiple Choice

Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation σ.
Assume that the population has a normal distribution. Round the confidence interval limits to the same number of decimal places as the sample standard deviation.
-Weights of men: 90% confidence; n = 14, $\overline { \mathrm { x } }$ = 161.5 lb, s = 13.7 lb

• A) \(10.2 \mathrm { lb } < \sigma < 19.3 \mathrm { lb }\)
• B) \(11.1 \mathrm { lb } < \sigma < 2.7 \mathrm { lb }\)
• C) \(10.4 \mathrm { lb } < \sigma < 20.3 \mathrm { lb }\)
• D) \(10.8 \mathrm { lb } < \sigma < 17.7 \mathrm { lb }\)

---

Definitions:

Mortality

The incidence of death within a population; in research, it can also refer to the dropout rate of participants from a study.

Final Survey

The last questionnaire or series of questions administered to participants in a study to gather final data or feedback.

Independent Groups Design

An experiment in which different subjects are assigned to each group. Also called between-subjects design.

Swimmers

Individuals who engage in swimming, whether as a recreational activity, sport, or competitive pursuit.