Repeat Problem 6 assuming that you plan to use a model that contains age, weight of the mother at the last menstrual period and race. Consider the low-birth-weight study. What sample size would be...

Repeat Problem 6 assuming that you plan to use a model that contains age, weight of the mother at the last menstrual period and race.

Consider the low-birth-weight study. What sample size would be needed in a new study to be able to detect that the odds of a low-birth-weight baby among women who smoke during pregnancy is 2.5 times that of women who do not smoke, using 5% types I error probability and 80% power?