The observed correlation between baldness and heart disease demonstrates that:
A) being bald causes a man to have heart disease.
B) being bald actually makes heart disease less likely.
C) bald men are generally unreliable.
D) there is probably some other factor that causes both baldness and heart disease.
Ans: D) there is probably some other factor that causes both baldness and heart disease.
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Which of the following groups of people is included in the labor force of a country?
A) Part-time paid workers B) Retirees C) Disabled workers who can no longer work D) Adults who are full-time students
In general, one would expect that life expectancies reflect international differences in income levels. Do the data support such a claim?
A) Average life span falls as relative poverty falls. B) Average life span increases as relative poverty falls. C) There is no statistically significant relationship between the two. D) The relation is not very strong. E) The relationship looks more like a U-shape.