Experimental design

Question 1

Independent groups strength

Answer 1

Order effects are reduced because they only do it once.

Demand characteristics so they are less likely to guess the aim of the study or be prepared for it

Question 2

Independent groups weakness

Answer 2

Participants extraneous variable (how they grew up so you can’t control it)

Less economical – need more participants.

Question 3

Independent groups solution

Answer 3

random allocation (eg picking names out of hat, number generator)

Question 4

strength of repeated measure

Answer 4

Extraneous variables are controlled for (age, tiredness, gender ..)
Less participants needed.

Question 5

limitation of repeated measure

Answer 5

Order effect (practice effect or fatigue effect) eg. Get better the second time.

Demand characteristics – participants know what they are being tested so they can change their behavior.

Question 6

solution of repeated measure

Answer 6

Counterbalance (Reverse the order -ABBA)

Question 7

strength of matched pairs

Answer 7

Reducing/minimizing order effect, demand characteristic, extraneous variables

Question 8

weakness of matched pairs

Answer 8

time consuming and less economical