The company hiring manager SNC Technologies, company specialized in the manufacture and assembly of electromechanical parts, wants examine the statistical relationship that may exist between the results of a test of spatialization and the number of parts assembled during a working week. Thirty individuals from the assembly department participated in this experiment. Preliminary calculations lead to the following results:

Ex = 3081 Ey = 2315 E(x -x * (y - y) = 822,50 2 E(x -x) =2042,30 2 E(y -y ) =430,17 2 E(y -y ) = 331,25