USe of JMP is recommended The data set lowbwt also contains

USe of JMP is recommended

The data set lowbwt also contains sex, a dichotomous random variable designating the gender of each infant.

(a) Add the indicator variable sex – where 1 represents a male and 0 a female –to the model that contains gestational age. Given two infants with identical gestational ages, one male and the other female, which would tend to have the higher systolic blood pressure? By how much, on average?

(b) Add to the model a third explanatory variable that is the interaction between gestational age and sex. Does gestational age have a different effect on systolic blood pressure depending on the gender of the infant?

Solution