$($a$)$ Develop a linear regression model to predict Wal$-$Mart revenue, using CPI as the only independent variable. $($b$)$ Develop a linear regression model to predict Wal$-$Mart revenue, using Personal Consumption as the only independent variable. $($c$)$ Develop a linear regression model to predict Wal$-$Mart revenue, using Retail Sales Index as the only independent variable. $($d$)$ Which of these three models is the best?$$ Use R$-$square value, Significance F values and other appropriate criteria to explain your answer. Identify and remove the four cases corresponding to December revenue. $($e$)$ Develop a linear regression model to predict Wal$-$Mart revenue, using CPI as the only independent variable. $($f$)$ Develop a linear regression model to predict Wal$-$Mart revenue, using Personal Consumption as the only independent variable. $($g$)$ Develop a linear regression model to predict Wal$-$Mart revenue, using Retail Sales Index as the only independent variable. $($h$)$ Which of these three models is the best?$$ Use R$-$square values and Significance F values to explain your answer. $($i$)$ Comparing the results of parts $($d$)$ and $($h$),$ which of these two models is better?$$ Use R$-$square values, Significance F values and other appropriate criteria to explain your answer. Please use one Excel and show how each step is done.