The history of statistical hypothesis testing really began with a tea-tasting experiment (Fisher, 1935), so it seems fitting for this chapter to end with one. The owner of a small tearoom doesn’t think people really can tell the difference between the first cup made with a given tea bag and the second and third cups made with the same bag (which is why it is still a small tearoom). He chooses eight different brands of tea bags, makes three cups of tea with each, and then has a group of customers rate each cup on a 20-point scale (without knowing which cup is which). The data are shown here, with higher ratings indicating better tea:
Using Friedman’s test, draw the appropriate conclusions.
Engage. Prepare. Educate.

  • CreatedSeptember 22, 2015
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