Are people with bigger brains more intelligent? Forty college students volunteered to participate in a study which examined brain size (measured as 1000's of pixels counted in a brain scan), and IQ scores (measured in points). A scatterplot of the data is shown below.
-The p-value for this test is 0.008. What can we conclude?
A) We have strong evidence that an increase in brain size will increase IQ.
B) We have strong evidence that an increase in brain size is associated with an increase in IQ.
C) We have strong evidence that an increase in IQ will increase brain size.
D) We have strong evidence that brain size and IQ are not associated.

Question

Are people with bigger brains more intelligent? Forty college students volunteered to participate in a study which examined brain size (measured as 1000's of pixels counted in a brain scan), and IQ scores (measured in points). A scatterplot of the data is shown below. 
-The p-value for this test is 0.008. What can we conclude?
A) We have strong evidence that an increase in brain size will increase IQ. 
B) We have strong evidence that an increase in brain size is associated with an increase in IQ. 
C) We have strong evidence that an increase in IQ will increase brain size. 
D) We have strong evidence that brain size and IQ are not associated.

Quizplus · Accepted Answer

The p-value is less than 0.05, which means that there is a statistically significant association between brain size and IQ. The direction of the association is positive, meaning that an increase in brain size is associated with an increase in IQ.

Are People with Bigger Brains More Intelligent? Forty College Students