EXPERIMENTAL DESIGNS

Question 1

Independent measures design?

Answer 1

An experimental design in which
* Different ppts are used for each condition.

Question 2

Name 2 strengths of an independent measures design.

Answer 2

1. NO order effects: Ppts exposed to 1 level of the iv
2. NO Demand characteristics: Ppts are exposed to 1 level of the iv, less likely to guess experimental aims and alter behaviour.

Question 3

Name 2 weaknesses of an independent measures design

Answer 3

1. Ppts variables: Ppts differences in each group may introduce variability.
   2.Practical: Needs more ppts (smaller samples)

Question 4

Define repeated measures design

Answer 4

An experimental design in which
* The same ppts take part in all levels of the iv.

Question 5

Name 2 strengths of an repeated measures design.

Answer 5

1. Reduces ppts variables: Reduces an indiviudal differences that could affect DV.
2. Pratical: Fewer ppts are needed (v good if ppts are at risk or hard to find)

Question 6

Name 2 weaknesses of repeated measures design

Answer 6

1. Order effects: ppts may become fatigued or improve with practice as they progress through conditions
2. Demand characteristics: More likely to guess experimental aims

Question 7

What is a matched pairs design?

Answer 7

An experimental design in which
* Ppts are matched based on a given KEY characteristic, and each member of the pair performs in different condition.

Question 8

2 Weakesses. Matched pairs design

Answer 8

• Difficulty: FINDING ppts with closely matched characteristics.
• Small sample: More ppts needed as each condition needs a seperate group/ limited availability

Question 9

2 strengths. Matched pairs design

Answer 9

1. No ppts variables: As ppts are matched on key characteristics
2. No order effects: Exposed to 1 level of the iv