Referring to Section 12.2, the file tablets gives the measurements on chlor-pheniramine...

Referring to Section 12.2, the file tablets gives the measurements on chlor-pheniramine maleate tablets from another manufacturer. Are there systematic differences between the labs? If so, which pairs differ significantly? How do these data compare to those given for the other manufacturer in Section 12.2?

Reference

A one-way layout is an experimental design in which independent measurements are made under each of several treatments. The techniques we will introduce are thus generalizations of the techniques for comparing two independent samples that were covered in Chapter 11.

In this section, we will use as an example data from Kirchhoefer (1979), who studied the measurement of chlorpheniramine maleate in tablets. Measurements of composites that had nominal dosages equal to 4 mg were made by seven laboratories, each laboratory making 10 measurements. Data is shown in the following table. There are two possible sources of variability in the data: variability within labs and variability between labs.