A science instructor assigns a group of students to investigate the relationship between the pH of the water of a river and its water's hardness (measured in grains).Some students wrote these conclusions: "there was a very strong correlation of 0.902 grains between pH of the water and water's hardness." Is the calculation of the correlation appropriate?
A)No: there is little or no association.
B)Yes: the pH and the hardness of the water are data collected from the same river.
C)No: pH and hardness of water have different units.
D)Yes: correlation is less than 1.
E)No: correlation has no units.

Question

Quizplus · Accepted Answer

Correlation coefficients measure the strength and direction of a linear relationship between two variables on a scatterplot, and they do not have units. The statement incorrectly assigns units to the correlation coefficient.

A Science Instructor Assigns a Group of Students to Investigate