Suppose a Large Labor Union Wishes to Estimate the Mean $\bar { x } = 7.5$

question 80

Multiple Choice

Suppose a large labor union wishes to estimate the mean number of hours per month a union member is absent from work. The union decides to sample 348 of its members at random and monitor the working time of each of them for 1 month. At the end of the month, the total number of hours absent from work is recorded for each employee. If the mean and standard deviation of the sample are $\bar { x } = 7.5$ hours and $s = 3.5$ hours, find a $99 \%$ confidence interval for the true mean number of hours a union member is absent per month. Round to the nearest thousandth.

• A) \(7.5 \pm .258\)
• B) \(7.5 \pm .026\)
• C) \(7.5 \pm .483\)
• D) \(7.5 \pm .186\)

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Definitions:

Primacy

The principle that items or information presented first are usually remembered better than items presented later.

Genetic Factors

Elements of an individual's DNA that influence their physical attributes, behaviors, and susceptibility to certain diseases.

Parental Effect

The influence that parents have on the development, behavior, and personality of their children, often studied in psychology and behavioral genetics.

Allport

Refers to Gordon Allport, a psychologist who emphasized the uniqueness of the individual and the importance of the present context for understanding behavior.