Required Additional Problems: Use the LEAD.DAT.dta data in tabular form (available on canvas ) to construct your own plots using software (Stata preferred ) and answer questions below . Include your plots as part of your report and assessment of outliers and describe your analysis strategy for dealing with any outliers you detect . a) Recategorize lead group into two categories : unexposed lead group (lead_grp =1) and exposed lead group (lead_grp =2,3 ). (Hint : label the groups ) b) Assess whether there are any outliers for full -scale IQP (Performance IQ ) in the unexposed lead group and list all the outliers with IDs . c) Assess whether there are any outliers for full -scale IQP (Performance IQ ) in the exposed lead group and list all the outliers with IDs