A Science Instructor Assigns a Group of Students to Investigate

Multiple Choice

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.