Lecture 4 - ANOVA

Question 1

Report the results of a One way ANOVA

Answer 1

A one way between/ within participants ANOVA was conducted and concluded that there was/ was not a significant effect of Iv on the DV, F(between df, within d) = f value, P= p value, np2= np2.
Bonferroni corrected post hoc independent/ paired t tests were conducted and showed that level 1 was significantly/ not significantly different from level 2 t(df) = t value, p = p value.
With 95% confidence the means in the population will be between

Question 2

What is a bonferroni correction and why?

Answer 2

Dividing the cut off (0.05) by the amount of comparisons you are conducting to reduce the chance of a type 1 error.

Question 3

Define equal variance

Answer 3

Between
The difference between each value and the group mean, 2, sum of sqaures, divided by n.
There shouldnt be a significant difference between the variance in each group

Question 4

WHat tests equal variance

Answer 4

Levenes test

Question 5

What is equal sphericity

Answer 5

Within
Each condition is compared to the others. FOr instance, A-B, B-C, A-C. The differences between the differences are then measured, and if these differences are significant then the Greenhouse Geisser correction must be used.

Question 6

What tests equal sphericity

Answer 6

MAuchleys test

Question 7

What is the maths calculation for a between subjects anova

Answer 7

Between groups variance/ within groups variance.

Between groups variance= the treatment effect, individual differences and sampling error.
- Each group mean is - from the grand mean.
Within groups variance= Individual differences, sampling error.
-Normal variance.

Question 8

What is the maths calculation for a within subject anova

Answer 8

Between conditions variance/ Within subjects variance.

Between conditions variance = The treatment effect, sampling error.
- Grand mean- group mean
Within subject variance= pps mean - each condition pps mean.

Question 9

How to carry out a between ANOVA in SPSS

Answer 9

analyse – compare means- 1 way anova.

Two columns, 1 column is a grouping variable, the other is the dv.

Question 10

How to carry out a within ANOVA in spss

Answer 10

Analyse- general linear model – repeated measures.

3 columns- each is dv.

Question 11

How to carry out an independent t test in SPSS

Answer 11

Analyse- compare means – independent samples t test.

Question 12

How to carry out a paired t test in spss

Answer 12

Analyse- compare means- paired samples t test