Test Scores. Consider the following table comparing the grade averages and mathematics SAT scores of high school students in 1988 and 1998.
% Students | SAT Score |
| ||||
Grade Average | 1988 | 1998 | 1988 | 1998 | Change | |
A+ | 4 | 7 | 632 | 629 | -3 | |
A | 11 | 15 | 586 | 582 | -4 | |
A- | 13 | 16 | 556 | 554 | -2 | |
B | 53 | 48 | 490 | 487 | -3 | |
C | 19 | 14 | 431 | 428 | -3 | |
Overall average | 504 | 514 | + 10 | |||
Source: Cited in Chance, Vol. 12, No. 2,1999, from data in New York Times, September 2, 1999.
a. In general terms, how did the SAT scores of the students in the five grade categories change between 1988 and 1998?
b. How did the overall average SAT score change between 1988 and 1998?
c. Explain the apparent inconsistency in these results.
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