9. The article “The Effects of a Pneumatic Stool and a OneLegged Stool on Lower Limb Joint Load and Muscular Activity During Sitting and Rising” (Ergonomics, 1993: 519–535)

gives the accompanying data on the effort required of a subject to arise from four different types of stools (Borg scale). Perform an analysis of variance using
.05, and follow this with a multiple comparisons analysis if appropriate.

Subject 1 2 3 456 7 8 9 xi

1 12 10 7 7 8 9 8 7 9 8.56 Type 2 15 14 14 11 11 11 12 11 13 12.44 of 3 12 13 13 10 8 11 12 8 10 10.78 Stool 4 10 12 9 9 7 10 11 7 8 9.22