For a random sample of 10-year-olds, a researcher measured the number of books read in the last year (x) and verbal IQ (y). The sum of squares of x was 450, the sum of squares for y was 11,250. If the sum of products (spxy) is also 450, then ______.
a. r = .1
b. r = .2
c. r = .3
d. r = .4
Ans: B
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