6.1 There are two explanatory variables. They are brand of dripper and wet/dry filter. The response variable is the score for flavor on a scale from 1–10. There are three brands of drippers and wet or dry filters, so there are a total of six treatments (the six brand of dripper and wet/dry filter combinations). Two cups of coffee are brewed at each of these six treatments, so 12 cups of coffee are needed. Here is a diagram describing the treatments.

6.2 In this experiment, the instructors are the blocks, for which the 75 students in each class are split randomly into three groups of 25, each receiving a different version of the test. Exam scores would then be compared as the response variable. Here is a sample diagram.