Use the data in BWGHT.RAW to answer this question.
(i) How many women are in the sample, and how many report smoking during pregnancy?
(ii) What is the average number of cigarettes smoked per day? Is the average a good measure of the "typical" woman in this case? Explain.
(iii) Among women who smoked during pregnancy, what is the average number of cigarettes smoked per day? How does this compare with your answer from part (ii), and why?
(iv) Find the average offatheduc in the sample. Why are only 1,192 observations used to compute this average?
(v) Report the average family income and its standard deviation in dollars.