Research Designs

Question 1

Independant measures

Answer 1

Ppt take part in one condition (2 separate groups)
\+avoids order effects
\+less demand characteristics
-more ppt needed
-Ppt variables

Question 2

Repeated measures

Answer 2

Ppt take part in both (1 group)
+ppt variables are avoided (compare score of individual)
+fewer ppt
-order effects
-demand characteristics
*counterbalencing (alter order to eliminate order effects)

Question 3

Matched pairs

Answer 3

Ppts matched in each condition for characteristics that may have an effect on their performance eg IQ, age, previous scores on tests.

\+reduced ppt variables
\+avoids order effects
\+less DC
-time consuming
-impossible to match completely
-requires more ppt