Experimental Designs Flashcards
1
Q
what are the types of experimental designs?
A
- independent groups
- repeated measures
- matched pairs
2
Q
what is independent groups design?
A
- two separate groups of ppts experience two different conditions
- two levels of independent variable, one group is assigned to one IV
- performance of 2 groups would be compared
3
Q
what is a strength of independent groups design?
A
- no order effects
- less demand characteristics = less likely to guess the aims
- less economical that repeated measures, each ppt contributes a single result only
4
Q
what is a weakness of independent groups design?
A
- difference on the DV may be due in participant variables
- differences may act as a confounding variable , reducing validity of finding
- more time consuming = more ppts needed compared to repeated measures
5
Q
how do we overcome the problem of participant variables in independent groups design?
A
- use random allocation, e.g using a hat
6
Q
what is repeated measures design?
A
- all participants experience both conditions of the experiment
7
Q
what are the weaknesses of repeated measures design?
A
- order effects, e.g. boredom which could deteriorate performance in the second task
- demand characteristics
8
Q
what are strengths of repeated measures design?
A
- participant variables are controlled
- fewer participants are needed
