Question: Two groups of skilled workers are to be compared on a test of skill in operating a numerical control machine. The results obtained by the

Two groups of skilled workers are to be compared on a test of skill in operating a numerical control machine. The results obtained by the two groups on the aptitude test are presented below:

\fTest sur deux variances (assume populations normales) Donnees Hypothese nulle, 61/62 =1 Seuil de signification, a = 0,01 Ecart reduit F Taille de l'echantillon #1, n1 25 Ecart-type de l'echantillon #1, S1 1,4491 Taille de l'echantillon #2, 12 36 Ecart-type de l'echantillon #2, S2 1,0488 Ecart-reduit F 1,9090 Degre de libertes de l'echantillon #1, n1 24 Degre de libertes de l'echantillon #2, n2 35 Test bilateral Valeur critique inferieure, F Valeur critique superieure, F Seuil description

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