Consider the data in Problem 5-5. Analyze the data, assuming that replicates are blocks.

Problem 5-5

Johnson and Leone (Statistics and Experimental Design in Engineering and the Physical Sciences, Wiley, 1977) describe an experiment to investigate warping of copper plates. The two factors studied were the temperature and the copper content of the plates. The response variable was a measure of the amount of warping. The data were as follows:

Copper Content (%) Temperature (C) 40 60 80 100 28, 27 27, 31 50 17, 20 16, 21 24, 22 75 12, 9 18, 13 17, 12 100 16, 12 18, 21 25, 23 30, 23 125 21, 17 23, 21 23, 22 29, 31