Fit linear and quadratic trend components to the Conti and Musty (1984) log transformed data in Table 11.6. The control condition received 0 mg of THC. For purposes of this example, assume that there were 10 subjects in all groups. (You could add a 2.56 to the 0.5 mg group and a 2.35 and 2.36 to the 1 mg group without altering the results appreciably.) The linear coefficients (calculated with unequal spacing on the independent variable) are

[20.72, 20.62, 20.22, 0.28, 1.28]. The quadratic coefficients are [0.389, 0.199, 20.362, 20.612, 0.387].

Verify your answers using SPSS ONEWAY if you have it available.