Sales (in thousands) of the new Thorton Model 506 convection oven over the eight-week period since its introduction are shown in the following table. Week Sales 1 18.7 2 21.3 3 25.1 4 22.3 5 24.5 6 19.1 7 21.6 8 23.9 What is the MSE using = 0.6? 7.88 9.00 10.50 12.60