The following data were taken from the article Toxaemic Signs
The following data were taken from the article “Toxaemic Signs During Pregnancy” [Applied Statistics (1983) 32: 69– 72]. The data given here relate signs of toxemia, the presence or absence of hypertension and proteinuria, for 13,384 pregnant women classified by social class and smoking habit. The aim of the research was to determine if the amount of smoking and social class of the women were associated with the incidence of signs of toxemia. The explanatory variables were ­social class (I, II, III, IV, V), an ordinal- level variable, and level of smoking (1— none; 2— 1 to 19 cigarettes per day; 3— 20 or more cigarettes per day).
a. Determine a model to relate the probability of hypertension in a pregnant woman to social class and smoking level.
b. Predict the probability of hypertension in a pregnant woman of social class III smoking 20 or more cigarettes per day.
c. Place a 95% confidence interval on the probability of hypertension in a pregnant woman of social class III smoking 20 or more cigarettes per day.
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