Experimental Groups Designs!

Which of the following statements about random selection is NOT true?

• each member of the population has an equal probability of being drawn
• It leads to more external validity!
• It may affect your statistical power
• It is dependent upon the representativeness of the participants in the experiment to those who were not included

Why is it better to have equal sample sizes?

• For power and data evaluation validity 
• To improve internal validity
• It makes your findings more generalizable 
• It improves construct validity 

What is the current default emphasis in selecting samples? 

• Including a diverse sample 
• Selecting homogenous subjects for research  
• WEIRD samples 
• Limiting samples to narrow groups of people 

A quasi-experimental design.... 

• uses random assignment 
• is the gold standard 
• occurs when an experimenter doesn't have control of the IV 
• are also called nonequivalent control group designs 

If I was to explore the effects of CBT on depressive symptoms and had therapists in one clinic use CBT and therapists in another clinic do treatment as usual and then assessed whether the treatment reduced symptoms, I would be using a .....

• Pretest-posttest control group design 
• Posttest-only control group design 
• Solomon four groups design 
• posttest-only quasi-experimental design

Which of the following best accounts for the effects of pretesting?

• Factorial design
• Solomon Four Groups Design 
• Randomized Control Trial
• Quasi-Experimental design 

_____________ allow the simultaneous investigation of two or more variables in a single experiment. 

• Solomon Four Groups Designs 
• Factorial Designs 
• Quasi-experimental designs 
• Randomized control trial 

True or False: propensity matching involves looking for pairs of subjects with identical scores 

• True 
• False 

______________ is a special arrangement in where each condition (A,B, or C) occurs only once and only once in each position 

• Adaptive interventions 
• Chi Squares 
• Nonequivalent group designs 
• Latin square 

Which of the following is NOT an advantage of using pretests in research? 

• You are able to use propensity score matching 
• It increases power 
• It allows for evaluation of attrition 
• It increases test-retest reliability