Design a study and collect data. Kanai and colleagues performed MRI scans on student volunteers at University College, London. The results from each brain area were quite similar. You will examine results for the left middle temporal gyrus (which has been linked in other studies to facial recognition) for a follow- up study of 40 students. These results are shown below. Note that number of friends is given in units of 100 friends, so 0.30 = 30 friends, 1.09 = 109 friends, and so on. The brain density measurement is in "arbitrary units."Identify the observational units and sample size in this study