Experimental design

Question 1

What is an independent groups design

Answer 1

• ppts are allocated to different groups, representing one experimental condition

Question 2

Define the term repeated measures

Answer 2

• all ppts take part in all of the conditions in an experiment

Question 3

What is a matched pairs design

Answer 3

• pairs of ppts are matched together on some variables that may effect the DV before being split up into 2 conditions, one goes to condition A whilst the other goes into condition B, this is to avoid the chance that they will realise the aims of the study

Question 4

What is counterbalancing

Answer 4

• an attempt to control for the effects of order in a repeated measures design, 1/2 experience it in one order and the other half in the opposite order

Question 5

1- What is a strength of independent groups design

2- What is a limitation of independent groups design

Answer 5

• order effects are not a problem, ppts are also less likely to guess aims of a study
• ppts used are not the same so the results may be because of individual differences rather than the IV
• they are also less economical

Question 6

1- What is a limitation of repeated measures

2- What is a strength of repeated measures

Answer 6

• order effects, ppts are more likely to be able to guess the aim of the study, increasing the chance of demand characteristics
• ppt variables are controlled and fewer ppts are needed

Question 7

1- What is a strength of matched pairs design

2- What is a limitation of matched pairs

Answer 7

• order effects and demand characteristics are less of a problem
• time consuming and expensive