Using Pretests to Organize Groups Can Be Problematic Because Scores

question 26

Multiple Choice

Using pretests to organize groups can be problematic because scores on posttest measures may be affected not (just) by the treatment but by ______.

• A) history effects
• B) regression to the mean
• C) nonequivalent groups
• D) individual differences

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Definitions:

Scatter Diagram

A graphical representation of data points for two variables to determine if there is a relationship between them.

Scatter Diagram

A graphical representation of the relationship between two variables, using dots to show each observation in the dataset.

Interval Variables

Variables that have measurable distances between the values they can take, but do not have a true zero point.

Correlation Implies Causation

A logical fallacy that suggests if two variables are correlated, one variable must cause the other.