Brain Volumes A sample of human brain volumes (cm3) is obtained from those listed in Data Set 9 “IQ and Brain Size” from Appendix B: 1272, 1051, 1079, 1034, 1070, 1173, 1079, 1067. Constructing Normal Quantile Plots. In Exercises 17 and 18, use the given data values to identify the corresponding z scores that are used for a normal quantile plot; then identify the coordinates of each point in the normal quantile plot. Construct the normal quantile plot, then determine whether the sample data appear to be from a population with a normal distribution.