ANCOVA

Question 1

what is the logic of covariates?

Answer 1

to control for extraneous variables / to streamline an experimental design

Question 2

when should you use ANCOVA?

Answer 2

to adjust the means, adding in the covariate

Question 3

what is the extra assumption for ANCOVA?

Answer 3

homogeneity of regression slopes between the covariate and the outcome

Question 4

how do you report ANCOVA results?

Answer 4

F (df1 , df2) = F , p =

Question 5

what is df1?

Answer 5

the df for the variable you’re looking at

Question 6

what is df2?

Answer 6

the df error for the variable you’re looking at

Question 7

what is F?

Answer 7

the value of F

Question 8

what is the partitioning variance?

Answer 8

SSt is made up of SSm and SSr

Question 9

where does the covariate fall in the partitioning variance?

Answer 9

it overlaps the SSm and SSr

Question 10

how to interpret the SPSS results?

Answer 10

look at the significance of the covariate, does it have an influence on the DV / if the line where the covariate is, is significant, then the assumption is broken