The map I'm
presenting shows two different data sets concerning the 2009 SAT. The
first data set is the mean score of the 3 part test by state. The
second data set is the percentage of students that took the test.
Because the 2 data sets have a very obvious inverse relationship, I
chose to display the mean score data using a choropleth map. The mean
scores of the SAT are displayed by graduated symbols on top of the
choropleth map.
The
results of the map show an inverse relationship between the
percentage of students that take the SAT to the mean score by state.
The lower the percentage of students taking the test, the higher the
average. The higher the percentage of students taking the test, the
lower the average. All of the states falling in the lowest
percentile group of tests taken (3% - 11 %) fall in the 2 categories
with the highest averages. Maine has the highest percentage of
students that took the test, 90%, but the average score is only 1377.
On the other end, Iowa, tied with North Dakota and South Dakota for
the lowest percentage of test taken, has the highest ranking average.
The
trend in geographic locations of this inverse relationship is also
very defined. The Northeast US dominates in percentage of students
who took the test, having all of the states with the highest
percentage category (71.1% - 90.0). While all of the Midwest US has
the lowest percentage of students taking the test with the highest
average.
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