14.3 Brain size and intelligence. For centuries, people have associated intelligence with brain size. A recent study used magnetic resonance imaging to measure the brain size of several individuals. The IQ and brain size (in units of 10,000 pixels) of six individuals are as follows:

Make a scatterplot of these data if you have not already done so. Compare your plot with those in Figure 14.7. What would you estimate the correlation r to be?