Exam 12: Experimental Research: Weak and Strong Designs

If you were interested in determining whether a possible interaction effect existed between an extraneous variable and the independent variable, you should use what technique to control for the influence of the extraneous variable?

Explain why some experimental research designs are weak designs and others are strong designs.

Which of the control techniques has the most power to insure that extraneous variables do not have differential effects on the different groups in the experiment?

Factorial designs involve the manipulation of at least three independent variables.

In a factorial design, the mean scores in a row or column are called marginal means.

The repeated measures variable is also known as:

When trying to determine the effect of a treatment, the control group provides the researcher with an estimate of how the treatment group participants would have performed if they had not received the treatment.

Explain the concept of an interaction effect.

Often, we do not know at the start of an experiment what extraneous variables could affect our results. The best means of controlling for unknown sources of extraneous variables is:

An experiment involves:

Additive and interactive effects are potential threats to validity in which design?

Which of the following is not a characteristic of an experiment?