Research Methods Exam 4 Review

A typical effect size used in analysis of experiments is:

• Cohen's d

• Wilk's kappa

• Cohen's f

• Pearson's r

In a 2x4 design, what does the 4 represent?

• There are four IVs in the experiment

• There are 4 DVs in the experiment

• The second IV in the experiment has 4 levels

• There are 4 conditions in the experiment

In an experiment, each independent variable must have multiple ______

Within-groups designs include

• repeated measures designs

• concurrent measures designs

• counterbalanced designs

• pretest/posttest designs

____-groups designs involve participants experiencing every level of the independent variable.

To test the effects of chocolate on mood, Dr. Hershey studies two groups of people. For each group, he measures their mood, then has one group eat chocolate and the other eat nothing. Then, he measures their mood again. Dr. Hershey used what type of experimental design?

• pretest/posttest design

• concurrent design

• post-test only design

• repeated measures design

In an experiment were some participants read a positive news story and others read a negative news story, the researcher holds the length of the news stories constant. Here, length of news story would be considered:

• an IV

• a DV

• a control variable

• an extraneous variable

To make a causal claim, we need:

• covariance

• temporal precedence

• external validity

• lack of alternative explanations

To avoid ____ effects, the conditions must be ______.

• order; counterbalanced

• demand; equivalent

• counterbalanced; sequential

• estimation; precise

In an experiment, a significant difference between the means of two groups indicates:

• covariance

• temporal precedence

• a causal effect

• internal validity