Read in data set lumber.txt, courtesy of W. Galligan, presented in Table 4.3 of Applied Multivariate Statistical Analysis by R. Johnson and D. Wichern, Pearson, New Jersey, 2019.. The random variables are different measures of stiffness in a set of boards. The first is determined by response to a shock, the second is response to vibrations, and the third and fourth are static. Units are not given