Exhibit 7-5: a Researcher Finds a

Multiple Choice

Exhibit 7-5: A researcher finds a .40 correlation between the number of years a student has access to a computer and his or her attitude toward mathematics.The study used 20 subjects.
-Refer to Exhibit 7-5.What are the degrees of freedom in this case?

A) 39
B) 38
C) 19
D) 18