9. The following data were used to make the claim that the rising use of cellphones was causing an increased number of traffic accidents in a city. [4T] Year Cellphones Sold (thousands) Traffic Accidents 1998 78 3765 1999 104 3802 2000 157 4038 2001 217 4104 2002 476 4298 a) Find the correlation coefficient for these data and classify the correlation between the sales of cellphones and the numbers of traffic accidents. Correlation Coefficient Formula r= n( Exy) - ( Ex) (Zy) [ nEx2- ( Ex) = ] [ nzy2- ( Ey) 2]