[EX03-034] The following table lists the percents of students who receive free or reduced-price lunches compared with the percents who passed the reading portion of the state exam. The results are for Sandusky County, Ohio, and were reported in The Blade, a Toledo newspaper, on August 5, 2001. Sandusky County is a combination of 13 rural and urban schools. (Same data as in Exercise 3.21, p. 159.)

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% Free/ % % Free/ % Reduced- Passing Reduced- Passing School Price Lunches Reading School Price Lunches Reading - 29 66 8 47 58 2 29 59 9 29 88 3 23 62 10 17 68 4 60 53 11 22 60 5 57 53 12 38 47 6 50 57 13 15 62 7 49 54 Find: a. SS(x) b. SS(y) c. SS(xy) d. r