Assign to the variable explanatory$\_$vars the list of column labels LogGDP, Support, Life, Freedom, Generosity, Corruption for the explanatory variables of interest

Assign to the variable Y the data contained in the Happiness column in the df$1517$ dataframe

Assign to the variable X the data contained in the columns listed in explanatory$\_$vars $($hint: use the explanatory$\_$vars list to index into the df$1517$ dataframe$)$

Add a constant column to the exogenous data X

Print the value of X to verify that it has been constructed correctly