Refer to the Academy of Management Journal (August 2015) study of the charisma of top business leaders, Exercise 11.28. Recall that researchers collected data on 24 U.S. presidential elections from 1916 to 2008. Two variables of interest were Democratic vote share (measured as the percentage of voters who voted for the Democratic candidate in the national election) and the difference between the Democratic and Republican candidates' charisma values (both measured on a 150-point scale). These data are reproduced in the accompanying table.
a. Rank the Democratic vote share values.
b. Rank the charisma difference values.
c. Compute the differences in the ranks, part b.
d. Use the results, part c, to find Spearman's rank correlation coefficient between Democratic vote share and charisma difference.

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Charisma Difference Year Vote Share 1916 51.68 -6.0 1920 1924 1928 1932 1936 36.15 41.74 41.24 59.15 -60.0 18.0 4.0 -22.0 -14.5 62.23 1940 1944 1948 1952 1956 1960 54.98 53.78 52.32 44.71 -7.5 -10.0 -10.5 2.0 0.0 -34.5 42.91 50.09 1964 1968 1972 1976 1980 1984 61.20 49.43 38.21 51.05 44.84 40.88 -29.0 -20.5 -6.0 14.0 -12.0 -42.0 1988 1992 1996 2000 2004 2008 46.17 53.62 54.74 -34.0 18.5 -16.5 -2.5 48.5 13.5 50.26 48.77 53.69