The following summary statistics and two dotplots display data on 64 used textbooks. The price of each used textbook was recorded from the University of California, Los Angeles (UCLA) campus bookstore and from Amazon.
-If you were to create a scatterplot of the 64 textbooks, where the textbook's price at the UCLA bookstore was plotted on the x-axis, and the textbook's price on Amazon was plotted on the y-axis, what would be the value of the correlation coefficient?
A) The correlation coefficient would be positive.
B) The correlation coefficient would be negative.
C) The correlation coefficient would be near zero.
D) We are unable to determine the sign of the correlation coefficient from the information provided.

Question

The following summary statistics and two dotplots display data on 64 used textbooks. The price of each used textbook was recorded from the University of California, Los Angeles (UCLA) campus bookstore and from Amazon.  
-If you were to create a scatterplot of the 64 textbooks, where the textbook's price at the UCLA bookstore was plotted on the x-axis, and the textbook's price on Amazon was plotted on the y-axis, what would be the value of the correlation coefficient?
A) The correlation coefficient would be positive. 
B) The correlation coefficient would be negative. 
C) The correlation coefficient would be near zero. 
D) We are unable to determine the sign of the correlation coefficient from the information provided.

Quizplus · Accepted Answer

The correlation coefficient would be positive because the prices of the textbooks at the UCLA bookstore and on Amazon are likely to be positively correlated. This means that as the price of a textbook increases at the UCLA bookstore, the price of the same textbook on Amazon is also likely to increase.

The Following Summary Statistics and Two Dotplots Display Data on 64