For which data set is a linear regression most reasonable?
A
a set of six data pairs with a correlation coefficient r is equal to 0 point 6B
a set of four data pairs with a correlation coefficient r is equal to negative 0 point 8C
a set of five data pairs with a correlation coefficient r is equal to 0 point 3D
a set of nine data pairs with a correlation coefficient r is equal to negative 0 point 4