Consider a large number of countries around the world. There is a positive correlation between the number of laptops
per 1000 people (x) and the average life expectancy (y). Does this mean that we could increase the life expectancy in
Rwanda by shipping laptops to that country?
(A) No, if the correlation were negative, we could accept that conclusion, but this correlation is positive.
(B) No, the positive correlation just shows that richer countries have both more laptops and higher life expectancies.
(C) Yes, the positive correlation means that if we ship laptops, we can expect an increase in life expectancy.
(D) Yes, the correlation says that as the number of laptops increases, it causes life expectancy to increase.