A school is interested to see if a test preparation course improves students' test scores. The 50 students are given pre-test before taking the course and post-test right after taking the course. Both test scores were recorded.

1.What are the variable(s) in the study? (include units)

2.What is the level of measurement of the variable(s)? (Nominal, Ordinal, Continuous)

3.If there are groups are they related in any way?

4.What statistical test is most appropriate to use in analyzing the data given the information provided.