Experimental Design

Question 1

Independent group design

Answer 1

Different p’s complete each of the conditions of the experiment.

Question 2

Advantages of independent group design

Answer 2

randomly allocated - avoids researcher bias
No order effect - p’s participate in only one condition - high in internal validity

Question 3

Disadvantages of independent group design

Answer 3

Participant variable - if more p’s are with a particular characteristic are assigned to one of the group, it can influence the measurement of DV (extraneous variable)
- unrelated data - data cannot be paired with the two conditions

Question 4

Repeated measures

Answer 4

Same group of p’s complete all the conditions of the experiment

Question 5

Advantages of repeated group design

Answer 5

-produce related data - data can be paired with 2 of the conditions
- no participant variable - only one group used

Question 6

Disadvantages of repeated group design

Answer 6

oder effect - p’s become tired and uninterested
high in demand charcteristics

Question 7

How can you counterbalance the order effect in repeated group design?

Answer 7

using ABBA format - half of the p’s does condition A then B, The other half does B than A

Question 8

Matched Pairs

Answer 8

Paired p’s complete only one of each of the experiment. P’s complete a test and are paired on same characteristics

Question 9

Advantages of matched group design

Answer 9

no participant variables - p’s matched on characteristics
no order effect

Question 10

Disadvantages of matched group design

Answer 10

time consuming
needs twice as many p’s as repeated measures design