Assign to the variable explanatory$\_$vars the list of column labels 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 correctlyCreate an OLS model to fit Y to X$,$ dropping any missing data in the process, and assign the result to the variable model$2$

Fit model$2$ and assign the output to results$2$

Print the summary of the results in results$2$