Experimental Design 1 - Independent Groups

Question 1

What are the 3 (4) experimental designs?

Answer 1

1) Independent groups
2) Repeated measures. (+ Counterbalancing)
3) Matched pairs

Question 2

What are the 4 steps to Independent groups?

Answer 2

1 - Recruit a group of participants.

2 - Divide them into two equally sized random groups.

Group 1 = IV set for condition 1.
Group 2 = IV set for condition 2.

3 - Measure the DV for each group.

4 - Compare the results for each group.

Question 3

What are the two advantages of Independent Groups?

Answer 3

1 - Less demand characteristics, the ppts do not know what the change in IV is.

2 - Less order effects, people will not get bored or tired because it it quick.

Question 4

What are two disadvantages of independent groups?

Answer 4

1 - Investigator effects, because they are being carried out at the same time you cannot have the same investigator.

2 - Group differences, the results are not necessarily comparable because all individuals are different.