A great source of data and an explanation to go with them is an Internet site called the Data and Story Library (DASL) maintained by Carnegie Mellon University. Go to that site and examine the example on the relationship between brain size and intelligence. Use multiple regression to predict full-scale IQ from brain size (MRI-count) and Gender. The address is https://lib.stat.cmu.edu/DASL/Datafiles/Brainsize.html

(I have replaced three missing pieces of data and converted “Female” to 2 and “Male” to 1. The revised data are available at the following URL. Use those data. https://www.uvm.edu/~dhowell/

fundamentals9/DataFiles/BrainSize.dat)