What level of geography does the county20thcentury.shp file cover?
Open the theme table for county20thcentury. Access the open theme table tool or go to Theme–>Table. 4) How many records are in this table? 5) How many county polygons are in the data set? Go back to the map. Click on the Identify button (far left on the button bar) and click on one of the polygons. The data are mostly from the 1990 census. Remember that these are self-reported values–how people listed themselves–on the census forms. 6) Briefly describe the types of data that can you can analyze in this file: Note the coordinates in the upper right as you move around the view with your mouse. 7) What coordinate system is the data in? Save the project: File–>Save Project As – and name it county20thcentury.apr in your folder. Data Analysis Make View1 active. Go to the View–> Properties pull-down menu. Change the name of View1 to USA Counties Access the table behind the theme county20thcentury. Click on the field Pop1990. Access the menu: Field–>Statistics. 8) What was the total Unit
