A researcher finds a strong correlation between age and IQ, but believes it may

Question

A researcher finds a strong correlation between age and IQ, but believes it may be caused by exposure to formal education (the expectation that everyone at least complete high school is of fairly recently origin, for instance), If she is correct, what would you expect to see in a series of scatterplots between age and IQ, with each plot representing people with a similar level of education? The relationship between age and IQ will appear the same as is the overall plot. The relationship between age and IQ will appear much weaker. The relationship between age and IQ will appear much stronger. The relationship between age and IQ will appear the same in all plots. 3 attempts remaining

Explanation / Answer

Now, since the researcher believes that this may have been caused by higher levels of education,

It may be the case that the relationship will be stronger in high eduaction groups while weaker/no relationship in low education groups.

THe overall effect would be a weaker relationship between age and IQ. Hence, the correct answer is B

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