Table 2.10 presents data on mean SAT reasoning test scores classified by income for three kinds of tests: critical reading, mathematics, and writing. In Example 2.2, we presented Figure 2.7, which plotted mean math scores on mean family income.
a. Refer to Figure 2.7 and prepare a similar graph relating average critical reading scores to average family income. Compare your results with those shown in Figure 2.7.

b. Repeat (a), relating average writing scores to average family income and compare your results with the other two graphs.
c. Looking at the three graphs, what general conclusion can you draw?

Mathematics Critical Reading Writing Number of Test Takers Family Income ($) Mean SD Mean SD Mean SD 107 423 100000 245025 544 105 556 107 537 103