experimental designs

Question 1

what is repeated measures

Answer 1

all ppts take part in all conditions of the experiment

Question 2

what is matched pairs

Answer 2

ppts are matched closely with another ppts based on a specific thing

Question 3

what is independent groups

Answer 3

ppts are randomly allocated to one condition only

Question 4

advantages of repeated measures

Answer 4

all ppts receive all levels of the IV
compare ppts performance on 2 tests

Question 5

advantages of independent groups

Answer 5

ppts placed in separate independent groups. Each group does one level of the IV

Question 6

advantages of matched pairs

Answer 6

reduces ppt variables (individual differences) which increases internal validity

Question 7

disadvantages of repeated measures

Answer 7

when they do the second test they may get the purpose of the test which will change their behaviour

Question 8

disadvantages of independent groups

Answer 8

researcher cannot control the effects of ppt variables

Question 9

disadvantages of matched pairs

Answer 9

very time consuming
difficult to match ppts on key variables

Question 10

how to limit the disadvantages of repeated measures

Answer 10

a cover story can be presented about the purpose of the test

Question 11

how to limit the disadvantages of independent groups

Answer 11

randomly allocate ppts to conditions which theoretically distribute ppt variables evenly

Question 12

how to limit the disadvantages of matched pairs

Answer 12

restrict number of variables to match on to make it easier

Question 13

what are order effects

Answer 13

depending on the order you do your conditions will change your results