Chapter 10 Flashcards
One way designs
One independt variable is being manipulated
Two group experimental design
Two different levels of the indepedent variable (experimental and control groups)
3 types of one way designs
- Randomized
- Matched subjects
- repeated measures
Post test only
Dependent variable is measured only once after the independent variable manipulation
Pretest-post test design
A pretest measure is taken before the IV is manipulated and then a post test is taken afer manipulation and each score is compared
Advntages and disdvantages of pretest-posttest designs
Ad:
-verify groups wernt biased to begin with
-how much ind. variable changed partici[ants behaivor
-more powerful
Dis:
-could skew data toward doig better on post test
(Pretest sensitization, practice effects)
Factorial designs
-allow for more than one independent variabe and a;lows us to study main effects and interactions
4 basic types of factorial designs
- Two way
- Higher order
- Split plot
- 2x2 experricor or mixed
Two way factorial designs
Loks at 2 IVs
Higher order factorials
Looks at at least 3 IVs
Split plot
Could be a 2 way design but 1 IV is between subjects(randomly assigned) and the other variable we get repeated measures(subjects recieve both levels of IV)
2x2 expericcor or mixed
Studies independent and subject variables(cant randomly assign these variables) then subjects are put into differnt levels of experimental variables
Main effects
Effect of a single IV
Interactions
Effect on the IV when it differs across the levels of another IV