Scale vs Scale paired
If you have two scale variables you might either be interested if there is a relation/association/correlation between the two, or you might be interested if the average is different between the two. If you are interested in the relation please go to the unpaired section here. This section will focus on the difference in averages.
To analyse if the means (averages) are different between two scale variables, we can go over the following steps:
1) Get an impression from the sample data by determining some descriptive measurements (mean and standard deviation).
2) Visualise the sample data by creating a scatterplot from the two variables and/or a histogram of the differences.
3) Test if there the difference in sample means could also occur in the population, and the effect size that goes with it.
4) Combine all the findings in one report.
For each step a separate page has been created. Let's begin with the impression on the first page.