1. Summarize the differences in purpose of a one-way analysis of variance and an analysis of covariance. 2. Suppose we use a centered variable for the covariate and express the interaction model when...

1. Summarize the differences in purpose of a one-way analysis of variance and an analysis of covariance.

2. Suppose we use a centered variable for the covariate and express the interaction model when the categorical predictor has two categories as

Explain how to interpret β₂. and explain how this differs from the interpretation for the model without a centered covariatc.