The minimum wages and the rigidity of employment index for sampled countries are given in the table below

sample countries minimum wages rigidity index

Country 1 $6 6

country 2 $11 9

country 3 $15 6

country 4 $21 10

Suppose that the majority of employment index is determined as an average measure of the difficulty of hiring, the difficulty of firing, and the rigidity of working hours. This index ranges from zero to 20 where higher numbers represent higher labor market rigidity. Using the information above, the sample correlation coefficient is given as?