A Random Sample of 21 Pages Is Used to Estimate

question 15

Essay

A random sample of 21 pages is used to estimate the population variance of the number of typographical errors in a book. The sample mean and sample standard deviation are calculated as 7.34 and 5.11, respectively. Assume that the population is normally distributed.
A) Construct a 95% interval estimate of the population variance.
B) Construct a 99% interval estimate of the population variance.
C) Use your answers to discuss the impact of the confidence level on the width of the interval.

• A) Construct a 95% interval estimate of the population variance.
• B) Construct a 99% interval estimate of the population variance.
• C) Use your answers to discuss the impact of the confidence level on the width of the interval.

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Definitions:

James-Lange Theory

A theory of emotion suggesting that emotions occur as a result of physiological reactions to events.

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A concept in psychology referring to the degree of alertness, wakefulness, or activation of the central nervous system, impacting performance and behavior.

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