Question 14.1
14.1 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:
| Brain size: | 100 | 90 | 95 | 92 | 88 | 106 |
| IQ: | 140 | 90 | 100 | 135 | 80 | 103 |
Is there an explanatory variable? If so, what is it and what is the response variable? Make a scatterplot of these data.
14.1 The researchers are seeking to predict IQ from brain size. Thus, brain size is the explanatory variable. The response variable is IQ. The following figure is a scatterplot of the data.
