The human resources manager of MAE, a manufacturer of high-tech products for the aerospace industry, is concerned about the absenteeism of employees assigned to the assembly of parts. According to him, the level of absenteeism is higher at the Ville St-Laurent plant than at the Longueuil plant.

The two-variance test concludes that the variances of the two populations are not equal.

Test d'egalite des esperances pour deux populations de variances egales Ville St-Laurent Longueuil Moyenne 9.500 8.430 Variance 0.805 1.992 Observations 23 23 Variance ponderee 1.398 Difference hypotheticue des moy 0 Degre de liberte 44 Statistique t 3.067 P(T