Compute a weighted average of the slopes of Weight predicted from Height for each gender in Exercise 11.18. Reasonable weighting coefficients would be the two sample sizes. (A weighted average is simply How does that average compare to the slope for Height that you found in Exercise 11.17?

Exercise 11.18

In Exercise 11.17 we ran a multiple regression with Gender as a predictor. Now run separate regressions for males and females.

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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(NMX b + NEX bF)/(NM + NF).)