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?

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Mathematics Critical Reading Writing Number of Test Takers Family Income ($) Mean SD Mean SD Mean SD 107 423 <10,000 10000-20000 40610 427 451 122 104 106 72745 453 472 113 446 102 20000-30000 61244 454 102 465 107 444 97 476 106 30000-40000 83685 103 485 466 98 75836 103 40000-50000 489 486 105 477 99 50000-60000 80060 497 102 504 104 486 98 60000-70000 75763 504 102 511 103 493 98 70000-80000 81627 508 101 516 103 498 98 529 80000–100000 130752 520 102 104 510 100 >100000 245025 544 105 556 107 537 103