A teaching assistant gives a quiz with ten questions and no partial credit. After grading papers, the TA writes down for each student the number of questions that student got right and the number wrong. The average number of right answers is 6.4 with a SD

A teaching assistant gives a quiz with ten questions and no partial credit. After grading papers, the TA writes down for each student the number of questions that student got right and the number wrong. The average number of right answers is 6.4 with a SD

A teaching assistant gives a
quiz with ten questions and no partial credit. After grading papers, the TA
writes down for each student the number of questions that student got right and
the number wrong. The average number of right answers is 6.4 with a SD of 2.0;
the average number of wrong answers is 3.6 with the same SD of 2.0. The
correlation between the number of right answers and the number of wrong answers
is


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