Intelligence and arithmetic ratios. Psychological tests of intelligence and arithmetical ability were applied to 10 child- ren. Here is a record of ungrouped data showing intelligence and. arithmetic ratios. Calculate Pearson's coefficient of correlation. Child : IR. - A.R.: A 105 104 101 103 E 100 95 F 99 96 J 92 94 C D 98 104 96 92 93 97 102 101 100 98

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