Discovr_12

Question 1

It’s easier to interpret the categorical predictor if

Answer 1

We know that levels of the covariate are similar across the categories

Question 2

How do you test the independence of the covariate

Answer 2

• Fitting a model using lm() that predicts the covariate from the categorical predictor
• If the categorical predictor does not significantly predict the covariate they might be independent

Question 3

If you want to use type 3 sums of squares then you must

Answer 3

Set orthogonal contrasts

Question 4

If we didn’t have a specific hypothesis to test with type 3 squares we should set

Answer 4

A Helmert contrast

Question 5

What can be used to work out power

Answer 5

• Sample size
• Effect size
• Power can be used to work out the others