Unit 5: How a Randomized Block Design Differs From a One-Way ANOVA

In this unit we look at two datasets that illustrate randomized block designs. In the first, three real estate appraisers independently examined each of five properties chosen at random from a particular neighborhood and gave appraised values. The manager of the appraisal service that employs them suspects that systematic differences among their methods of appraisal are causing undesirable inconsistencies in appraised values provided by her service. The issue is whether there are, in fact, systematic differences among the values reported by the three appraisers. The data, appraised values in thousands of dollars, are shown below.