You are a historian studying britain. you believe that a rise in the average british citizen’s income between 1800 and 1850 can be linked to a rise in literacy. you have many sources of data from a town in britain covering that period. which four types of data would you study to investigate this theory?

I would use two sources of data for income and two for literacy. For average income I would consult the censuses if they were available at that time. In particular I would check the differences between the years 1800 and 1850. Also I would check employment records for the same trades/professions for the two years. For literacy, I would check the school records to see if there was an increase in youth completing high school and also check the university records to see how many graduates there were in  the two years.