Omnibus ANOVA tests

Question 1

Define variance

Answer 1

Dispersion or spread of scores around a point of central tendency (the mean).

Question 2

What does an interaction reveal about simple effects?

Answer 2

The simple effects of one factor differ at various levels of the other factor.

Question 3

What assumptions are made about the population in ANOVA? (2)

Answer 3

Treatment populations are normally distributed and have the same (homogeneous) variance.

Question 4

In ANOVA, samples are assumed to be … (3)

Answer 4

1. Independent - not drawn from the same participant.
2. Obtained by unbiased random sampling.
3. Equal n with at least two observations per group.

Question 5

In ANOVA, DV scores are assumed to be ..

Answer 5

Measured on a continuous scale, either interval or ratio.

Question 6

What is the null hypothesis for an interaction?

Answer 6

Differences between one factor at each level of another factor will be equivalent across all levels of that other factor.