The management of a Quebec company, which operates 24 hours a day, would like to compare the productivity of its employees by shift. This was done by recording the number of units manufactured during each shift of a 5-day sample. It is assumed that the variable describing "the number of units manufactured" is distributed normally. The results obtained are presented in the following table: Number of units Day shift Evening shift Night shift manufactured Day 1 7 9 6 Day 2 4 10 2 Day 3 3 10 Day 4 8 Day 5 6 9 3 The analysis of variance table is as follows: Source of variations Sum of squares Degree of freedom Average of squares Attributable to factor A SCa k-1 CMA Residual (unexplained) SCRES n-k CMRES Total SCT n-1