Which data do you think produce a larger correlation between

Which data do you think produce a larger correlation between the weight and the price of diamonds: using a collection of gems of various cuts,colors, and clarities, or a collection of stones that have the same cut, color and clarity

A.The correlation is larger among stones of various cuts,colors and clarities. These factors add variation around the correlation line. By forcing these to be different, the pattern is more consistent.

B.The correlation is larger among stones of the same cuts,colors and clarities. These factors remove variation around the correlation line. By forcing these to be the same, the pattern is less consistent.

C.The correlation is larger among stones of same cuts,colors and clarities. These factors add variation around the correlation line. By forcing these to be the same, the pattern is more consistent.

D.The correlation is larger among stones of various cuts,colors and clarities. These factors remove variation around the correlation line. By forcing these to be different, the pattern is less consistent.

Solution

Standard deviation of weights of gems of various cuts is high.

Hence C is answer