Dr Zelke Surveys 50 University Students to Discover the Relationship

Dr. Zelke surveys 50 university students to discover the relationship between textbook price and ratings of readability. Dr. Zelke finds that for these two variables the correlation coefficient is -0.70. What does this indicate?

A) More expensive books tend to receive lower readability ratings than less expensive books.
B) Increasing the price of a book will lead people to think that it is more readable.
C) Increasing a book's price will cause a decrease in its readability rating.
D) There is no relationship between book price and ratings of readability.