Chapter 8: Experimental designs: Between-subjects design
Introduction to between-subjects experiments
Applications and statistical analyses of between-subjects designs
Individual differences as confounding variables
Other threats to internal validity of between- subjects experimental designs
Individual differences and variablity
Limiting confounding by individual differences
Review of the experimental research strategy
Characteristics of between-subjects designs
Independent scores
Advantages and disadvantages of between-subjects designs
Individual differences
Other confounding variables
Confounding from individual differences
Confounding from environmental variables
Equivalent groups
Random assignment (Randomization)
Matching groups (Matched assignment)
Holding variables constant or restricting range of variability
Summary and recommendations
Differences between treatments and variance within treatments
Minimizing variance within treatments
Stadardize procedures and treatment settings
Limit individual differences
Random assignment and matching
Sample size
Summary and recommendations
Differential attrition
Communication between groups
Two-group mean difference
Comparing means for more than two groups