Which of the following statements is true?

A study on a sample of 100 university students reports that the correlation coefficient between the students’ attendance at accounting final accounting exam grade is 0.7.

Which of the following statements is true?
A . 7% of an increase in grade can be explained by an increase in attendance.
B . Low attendance at lectures caused students to achieve lower grades
C . Students who attended more lectures tended to achieve higher grades
D . If we considered the same sample of 100 students, the correlation between attendance at economics lectures and their final econ would also be positive

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Answer: D