A large department store has collected the following monthly data on lost sales revenue due to theft and the number of security guard hours on duty:
Lost Sales Revenue
in Thousands Total Guard Hours
1.0 600
1.4 630
1.9 1000
2.0 1200
1.8 950
2.1 1300
2.3 1350
Calculate the coefficient of correlation.
coefficient of correlation = 0.0014
coefficient of correlation = 0.3780
coefficient of correlation = 0.955
coefficient of correlation = 0.6785