Consider a Large Number of Countries Around the World

question 28

Multiple Choice

Consider a large number of countries around the world. There is a positive correlation between the number of cell phones per person x and the average life expectancy y. Does this mean that we could increase the life expectancy in Rwanda by shipping cell phones to that country?

• A) Yes. The correlation says that as the number of cell phones per person goes up, so does life expectancy.
• B) No. If the correlation were negative, we could accept that conclusion, but this correlation is positive.
• C) Yes. Positive correlation means that, if we increase x, then y will automatically increase.
• D) No. The positive correlation just shows that richer countries have both more cell phones per person and higher life expectancies.
• E) It makes no sense to calculate correlation between these variables.

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