multiple choice questions for Objective 11

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Chapter 7

This activity contains 5 questions.

Which of the following is a purpose of prediction studies?

	It facilitates decisions about individuals to help a selection decision.
	It tests variables believed to be good predictors of a criterion.
	It determines the predictive validity of an instrument.
	All of these

Relationship and prediction studies differ with regard to

	the direction of the correlation coefficients.
	the percentage of variation in the criterion variable explained by the predictor variable.
	the data collection of the criterion variables occurring at different times.
	the variability of scores.

A researcher studied the predictors of dropout rates of urban school students over many years. He found his set of predictor variables explained 89% of the variability in the likelihood to quit school. In a study of 10,000 students in five rural school districts, the predictor variables accounted for only 45% of the variance. What is the most likely explanation for this finding?

	Validity of instruments
	Attenuation
	Sample size
	Shrinkage

When students' GPA in their freshmen year of college is predicted from their ACT scores and high school GPA, the analysis is known as

	linear regression.
	correlation.
	r².
	multiple regression.

Which of the following affects the accuracy of a prediction equation?

	Errors of measurement
	Intervening variables
	Criterion variables measured in general terms
	All of these

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