MATH 1342 Name Elementary Statistical Methods ab 3 - Ch.4 - Linear Regression Critical Thinking; Communication Skills; Empirical/Quantitative Skills Researchers wondered whether the size of a person's brain was related to the individual's mental apacity. They selected a sample of right-handed introductory psychology students who had SAT cores higher than 1350. The subjects took the Wechsler Adult Intelligence Scale-Revised to obtain heir IQ scores. MRI scans were performed at the same facility for the subjects. The scans consisted f 18 horizontal MR images. The computer counted all pixels with a nonzero gray scale in each of the 8 images, and the total count served as an index for brain size. MRI Count IQ 816,932 133 951,545 137 991,305 138 833,868 132 856,472 140 852,244 132 790,619 135 866,662 130 857,782 133 948 066 120