Who has the higher mean salary?

I have taken data sets from three different sources (The Queensland Government Open Data Portal - Crime by Postcode for April 2020, The Australian Bureau of Statistics Portal - Index of Economic Resources (IER), Socio-economic Indexes for Areas (SEIFA) 2016 data by Postcode and The Australian Tax Office - 2017-18 Individual Income or Loss by Postcode) and read them into R. This data set is now ready to have some statistical analysis performed over it. Of interest would be the relationship between crime and earnings by postcode and/or crime and SEIFA by postcode in Brisbane for April 2020.