Two items R and S belong to one test of numerical ability. Item R is passed by 50 and failed by 40 students in a group of 90 stu- dents. Item S is passed by 60 and failed by 30 students in the same sample. Find the correlation between R and S.

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Q: Which is the strongest (highest) r correlation:  -0.9000 -0.6000 -0.3000 0.4500

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