What should be the only difference between the experimental groups?
a. Levels of the independent variable
b. Levels of the dependent variable
c. Levels of the extraneous variable
d. Type of internal validity
e. Type of external validity
For each of the following research examples, identify
a. The independent variable
b. The dependent variable
c. The constructs being investigated
d. The operations used to represent these constructs
e. How you would collect evidence indicating the construct validity of the operations