18. You wish to describe the relationship between exam grades and the amount of

Question

18. You wish to describe the relationship between exam grades and the amount of time students watch the Discovery Channel. The correlation turns out to be r = +0.30. What does this mean? A. The more a student watches the Discovery Channel, the higher his or her exam grades tend to be. B. The more a student watches the Discovery Channel, the lower his or her exam grades tend to be. C. In order to increase your exam grades, it is recommended that you spend more time watching the Discovery Channel. D. 30% of the variation in exam grades is explained by the linear relationship with time spent watching the Discovery Channel.

Explanation / Answer

Ans:

Option A is correct.

Correlation cofficient,r indicates the strength and direction of association between two variables.

Positive correlation cofficient means that if x increases,then y increases.

Hence,Option A is correct.

Option B means negative correlation,so not correct.

Cofficient of determination,R2,indicates the proportion of variation in dpendent variable caused due to linear variation.(R2=0.32=0.09 or 9%),so,Option D is not correct.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.