Added data file for 'Dot Plots with Excel' tutorial

Author: tarzzz

dot-plot-with-excel.csv

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+School,Women,School,Men,gap
+UCLA,64,UCLA,78,14
+SoCal,72,SoCal,81,9
+Emory,68,Emory,82,14
+Michigan,62,Michigan,84,22
+Berkeley,71,Berkeley,88,17
+Brown,72,Brown,92,20
+NYU,67,NYU,94,27
+Notre Dame,73,Notre Dame,100,27
+Cornell,80,Cornell,107,27
+Tufts,76,Tufts,112,36
+Yale,79,Yale,114,35
+Dartmouth,84,Dartmouth,114,30
+Chicago,78,Chicago,118,40
+Columbia,86,Columbia,119,33
+Duke,93,Duke,124,31
+Georgetown,94,Georgetown,131,37
+Princeton,90,Princeton,137,47
+U.Penn,92,U.Penn,141,49
+Stanford,96,Stanford,151,55
+MIT,94,MIT,152,58
+Harvard,112,Harvard,165,53