Chen 2017) (a) In addition to having homoscedastic data, name two preliminary checks that should be done before performing a regression analysis on two numerical variables. (b) Based on these two preliminary checks, which two numerical variables and which group in the study can we perform a regression analysis? Find a sentence in the Results section that supports your answer. (c) Find the correlation coefficient for the variables and the group you chose in part (b) using Table 2 (or the Results section.) (d) Compute the percentage of variability observed by the dependent variable that is due to its relation to the independent variable. (Show your work and round to one decimal place.)