experimental design

Question 1

independent groups design

Answer 1

-different participants complete in both conditions
-randomly allocated to condition

Question 2

independent groups design limitations

Answer 2

-participant variables: if more participants eith particular characteristic assigned to a group, can influence measurement DV (extraneous variable)
-need double participants to get same data

Question 3

repeated measures design

Answer 3

-same participants complete in each condition

Question 4

repeated measures design limitation

Answer 4

-order effects: taking part in first condition influences performance in second condition e.g worsen due to fatigue or boredom
-participants more likely figure out aim, alter behaviour due to demand characteristics

Question 5

counter balancing repeated measures design

Answer 5

-attempts to control order effects
-ABBA format, half participants complete condition A first then B, others condition B first then A

Question 6

independent groups design strength

Answer 6

-less likely work out aim than in repeated measures, reduce demand characteristics
-no order effects, only one condition

Question 7

repeated measures design strengths

Answer 7

-needs less participants than independent measures for same data
-participant variables not a problem as take part both conditions

Question 8

matched pairs design

Answer 8

-participants assessed and ranked on a characteristic
-matched with another participant similar characteristic, randomly assigned to condition

Question 9

matched pairs design strengths

Answer 9

-reduced participant variables as matched on relevant characteristic
-no order effects, take part one condition

Question 10

matched pairs design limitation

Answer 10

-matched pairs takes longer set up than others
-needs twice as many participants than repeated measures
-participants similar but not identical so may still be some participant variables between conditions that influence DV