Modify that file so that the variable Cylinders is replaced by the variable cylBore, which is displacement per cylinder, and replace the variable Origin with a dummy variable for each of the categories other than usa. In addition, remove data rows containing missing values, as demonstrated in class. Then determine the average observed MPG and the average variation among the observed MPG values. After that, address the hypothesis that MPG is NOT related to ANY $($or ALL$)$ of the observed factors.