multiple choice questions for Objective 9

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Chapter 7

This activity contains 4 questions.

Which of the following correlations might produce different results for the total sample and subgroups within the sample?

	Attitudes toward school for males and females
	Social studies scores for males and females
	Cardiovascular fitness levels for athletes and non-athletes
	Reading levels for students enrolled in extra-curricular activities and those not enrolled

The use of instruments with low reliabilities in relationship studies is known as.

	low variability.
	attenuation.
	subgroup differences.
	all of these.

Low variability in scores will affect a correlation coefficient in which of the following ways?

	Increases the correlation
	Changes the direction of the correlation
	Decreases the correlation
	None of the above

The possible range of scores on a math achievement test was 0-100. The observed range for a sample of 100 students was 80-90. The possible range for the same students' science scores was 0-100, and the actual range was 45-49. The correlation between math and science scores was .29. The researcher would be most justified in concluding that the strength of the correlation was affected by

	restriction of range.
	shrinkage.
	small sample size.
	attenuation.

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