Students can compare two populations when the samples are dependent.
Students can evaluate significance graphically.
The Bathroom Scale Activity starts out with a short exercise called the Letter Test . It was originally called the F test, but this might have been misinterpreted as Fisher's F test. The students have a brief opportunity to read a paragraph and record the number of F's in the paragraph. They write down their observations and then the class results are recorded. It can also motivate a discussion of measurement variability, which is pertinent to the Bathroom Scale Activity.