Question: Besides studying time, intelligence itself may be related to test performance. Suppose then that IQ (Z) is added to the two variables in Problem 21.

Besides studying time, intelligence itself may be related to test performance. Suppose then that IQ (Z) is added to the two variables in Problem 21.

Data From Problem 21

In preparing for an examination, some students in a class studied more than others. Each student’s grade on the 10-point exam and the number of hours studied were as follows:

Barbara Bob Deidra Owen Charles Emma Sanford Luis Hours Studied Exam Grade

Calculate a Pearson’s correlation coefficient and determine whether the correlation is significant.

Barbara Bob Deidra Owen Charles Emma Sanford Luis Hours Studied Exam Grade 4135 2 8 7 6 5215 at 600 9 7 8

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