Since you have the DASL data on brain size, note that it also includes the variables of height and weight. Predict weight from height and sex and compare with the answer for Exercise 11.17.

Exercise 11.17

The file at https://www.uvm.edu/~dhowell/fundamentals9/DataFiles/Fig9-7.dat contains Ryan’s height and weight data discussed in connection with Table 9.1. Gender is coded 1 = male and 2 = female. Compare the simple regression of Weight predicted from Height with the multiple correlation of weight predicted from both height and gender.

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Table 9.1 Examining Scatterplots by Division into Quadrants in Relation to the Means Wine consumption Above Below Heart disease Above Below 0 9 6 3