Reactivity to the study situation is a threat to:

• Internal Validity

• External Validity

• Statistical Conclusion Validity

• Construct Validity

When two or more independent variables are manipulated simultaneously,it allows researchers to test both main effects and interaction effects, this design is called a:

• Crossover design

• Pre-test only design

• Single-blind design

• Factorial design

Increasing the sample size and hence power increases:

• Construct Validity

• External Validity

• Internal Validity

• Statistical Conclusion Validity

Characteristics for experiments (or randomized controlled trials, RCTs) (check all that apply):

• Manipulation

• An intervention

• Control

• Randomization

• Participants

This is concerned with the generalizability of causal inferences

• Homogeneity

• Restriction of Age

• External Validity

• Construct Validity

Quasi-experimental studies involve:

• Intervention but no randomization

• Randomization, intervention, but no blinding

• No intervention, double blinding, no randomization

• Blinding, intervention, randomization, and a control group

Efforts to reduce attrition increases:

• Statistical Conclusion Validity

• Internal Validity

• External Validity

• Construct Validity

Researchers can expose the control group to which conditions listed below:

• A. No treatment

• B. An alternative treatment or standard treatment

• C. Placebo or pseudointervention

• D. All of the above

• E. A and C only