Question

a researcher finds a strong, positive correlation between the number of cell phones in a country and the countrys average life expectancy. which statement best explains this result?
a a third factor, such as economic development, influences both
b there is no relationship between the two variables.
c people who live longer tend to buy more cell phones
d having more cell phones causes people to live longer

Explanation:

Correlation does not imply causation. Just because there is a positive correlation between the number of cell phones and life expectancy does not mean one causes the other. A third - factor, such as economic development (which can lead to better healthcare - increasing life expectancy, and higher purchasing power - allowing more cell phone ownership), is a likely explanation. Option B is incorrect as there is a correlation. Option C is not a logical general explanation (it's not that individuals live longer and then buy more phones in a way that would account for a country - level correlation). Option D wrongly assumes causation from correlation.

Answer:

A. A third factor, such as economic development, influences both