In this example, you have tested how two different tutorials affect one’s ability to use an application. You’ve recruited subjects and randomly assigned each to either Tutorial_A or Tutorial_B. After completing their designated tutorial, they perform a task in the application, and you time how long it takes them.

A summary of this experiment data

What you need to do

  1. Download a CSV dataset from
  2. Read the data into R.
  3. Follow the simple effect size guide to understand the performance differences following the two different tutorials.
  4. Which tutorial yeilds faster performance (lower completion time)? How reliable is that difference?
  5. Report the results as you would in a paper.