This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Reporting just the average masks the fact that almost 85 percent of the women did not smoke. It makes more sense to say that the typical woman does not smoke during pregnancy; indeed, the median number of cigarettes smoked is zero. (iii) The average of cigs over the women with cigs > 0 is about 13.7. Of course this is much higher than the average over the entire sample because we are excluding 1,176 zeros. (iv) The average of fatheduc is about 13.2. There are 196 observations with a missing value for fatheduc , and those observations are necessarily excluded in computing the average. (v) The average and standard deviation of faminc are about 29.027 and 18.739, respectively, but faminc is measured in thousands of dollars. So, in dollars, the average and standard deviation are $29,027 and $18,739....
View Full Document