#8 Step 6: Mediator

Question 1

What is a mediator?

Answer 1

Mediator: A 3rd variable caused by the predictor variable (IV) that in turn causes the outcome variable (DV)

Mediation: implies a situation where the effect of the independent variable (IV) on the dependent variable (DV) is best explained using a 3rd mediating variable

Question 2

What is the mediation model?

Answer 2

Triangle between IV, Mediator and DV.
IV — DV
IV — Mediator
Mediator — DV

Question 3

Why is it better to use in experimental design rather than correlational design?

Answer 3

Because mediator implies causality (which correlational design cannot show)

Question 4

Why is mediation important?

Answer 4

1. Fine-grained understanding of the mechanism
2. Testing competing theories
3. Allows for intervention

Question 5

How to test mediation model?

Answer 5

1. Ensure that arrows are all pointing the right direction

2. Statistically control the mediator – if it has an effect on the DV (meaning the DV is changed), it is the mediator