Practical Data Analysis with JMP®

Matched Pairs: One Variable, Two Measurements

The t-distributions that underlie most of this chapter were the theoretical contribution of one William Gosset, so it is appropriate to conclude this chapter with some data originally collected by Gosset, whose expertise was in agriculture as it related to the production of beer and ale, the industry in which he worked as an employee of the Guinness Brewery.

This particular set of data contains measurements of crop yields from eleven different types of barley (referred to as corn) in a split plot experiment. Seeds of each type of barley were divided into two groups. Half of the seeds were dried in a kiln, and the other half were not. All of the seeds were planted in eleven pairs of farm plots, so ...