Week 10 Lecture Flashcards
1
Q
Why is variance necessary in research?
A
Without variance, there is nothing to test.
2
Q
Why do research designs control unwanted sources of variance?
A
In order to evaluate the effects of the independent variable.
3
Q
How do we maximise experimental variance?
A
Make sure that there are real differences between the groups (using a manipulation check).
4
Q
How do we control extraneous variance?
A
Make sure the groups are as similar as possible at the start of the study.
5
Q
How do we minimise error variance?
A
Control with careful measurement or with special designs (e.g., correlated-group designs).
6
Q
What is manipulation check?
A
An specific test of whether the independent variable manipulation actually worked the way it was intended.
