Designs

Question 1

what is an independent measures design?

Answer 1

ppts only take part in 1 condition of the experiment (requires 2 separate groups)

Question 2

what is a repeated measures design?

Answer 2

1 group of ppts take part in both conditions of experiment

Question 3

what is a matched pairs design?

Answer 3

ppts matched in each condition for characteristics that may have effect on their performance e.g IQ

Question 4

what are the STRENGTHS of an independent measures design?

Answer 4

• avoids order effects-if ppt involved in more than 1 tests, may become bored-effects validity
• less demand characteristics-do only 1 condition

Question 5

what are the WEAKNESSES of an independent measures design?

Answer 5

• more people needed for this design

- differences between ppts in groups may affect results -variations i n age/sex/social background(ppt variables)

Question 6

what are the STRENGTHS of repeated measures design?

Answer 6

• avoids problem of ppt variables

- fewer people are needed

Question 7

what are the WEAKNESSES of repeated measures design?

Answer 7

• order effects are more likely to occur

- demand characteristics more likely-ppt may guess aim as they take part in all conditions

Question 8

what are STRENGTHS of matched pairs design?

Answer 8

• reduces ppt variables (people are matched)
• avoids order effects
• less likely to see demand characteristics(only do 1 condition)-therefore less likely to guess purpose

Question 9

what are WEAKNESSES of matched pairs design?

Answer 9

• very time-consuming-trying to find closely matched pairs
• impossible to match people exactly-may be ppt variables
• requires more ppts