EXAMPLE 15.1 Experimental Design 1: Best Magazine Layout and Cover

In Example 14.1 (page 712), a magazine publisher wants to compare three different magazine layouts. To do this, she plans to randomly assign the three design layouts equally among 60 supermarkets. The number of magazines sold during a one-week period is the outcome variable.

Now suppose a second experiment is planned for the following week to compare four different covers for the magazine. A similar experimental design will be used, with the four covers randomly assigned equally among the same 60 supermarkets.