What Are Common Problems Encountered by Those Who Wish to Conduct

question 12

Multiple Choice

What are common problems encountered by those who wish to conduct research on the validity of police screening?

• A)Applicants try to present themselves in a positive light.
• B)Applicants who do poorly on screening evaluations are eliminated from the pool of applicants so one cannot evaluate whether predictions of poor
• Performance would have been valid.
• C)Testing actual police performance in the field is time-consuming and expensive.
• D)all of the above

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Definitions:

Variance

A measure of the dispersion of a set of data points around their mean value, indicating how spread out the data are.

Deviations

Differences between observed values and some reference value, often the mean of the dataset.

Standard Deviation

A gauge for assessing the spread or differentiation of values within a group of data points.

Variance

A measure of the spread of a set of values, calculated as the average of the squared deviations from the mean.