Consider the arsenic concentration data in Exercise 12-16.

(a) Discuss how you would model the information about the person€™s sex.

(b) Fit a regression model to the arsenic in nails using age, drink use, cook use, and the person€™s sex as the regressors.

(c) Is there evidence that the person€™s sex affects arsenic in the nails? Why?

Exercise 12-16

Cook Drink Arsenic Arsenic Use Age Sex Use Water Nails 44 2 5 5 0.00087 0.119 45 4 5 0.00021 0.118 44 5 5 0.099 66 3 5 0.00115 0.118 37 1 2 5 0.277 45 2 5 5 0.358 0.08 47 1 5 5 0.00013 38 2 5 0.00069 0.158 41 2 3 0.00039 0.31 49 2 4 5 0.105 72 2 5 0.073 45 2 5 0.046 0.832 53 1 5 5 0.0194 0.517 86 0.137 2.252 8. 2 5 5 0.0214 0.851 0.0175 32 2 5 5 0.269 44 1 5 5 0.0764 0.433 63 2 5 5 0.141 0.275 42 1 5 5 0.0165 0.00012 62 5 0.135 36 1 5 5 0.0041 0.175 n n nn n n n nn