Answer these Questions

1.    You are given the following variables age (scale), blood pressure (scale), sex (nominal), degree level (ordinal).  Using some (not all) of these variables, create an example of one independent variable – one dependent variable research question and two independent variables one dependent variable research question. This second one should have both independent variables impacting the same dependent variable.

2.    Why is a between-groups variance explainable and a within-group variance unexplainable?

3.    Why is knowledge of within-group variance in each group necessary to make a decision about reliable differences between two groups mean performances?