The table at the top of the next page is adapted from Doll and shows per capita consumption of cigarettes in various countries in 1930, and the death rates from lung cancer for men in 1950. (In 1930, hardly any women smoked; and a long period of time is needed for the effects of smoking to show up.) PL968

(a) Plot a scatter diagram for these data.

(b) True or false: the higher cigarette consumption was in 1930 in one of these countries, on the whole the higher the death rate from lung cancer in 1950.
Or can this be determined from the data?

(c) True or false: death rates from lung cancer tend to be higher among those persons who smoke more. Or can this be determined from the data?