S 10 7 points An Engineer wants to compare the effect of 4 chemical additives (A1, A2, A3, A4) on the amount of dangerous materials removed from an industrial waste solution. He run an experimental study using the different additives. He measured the amount of dangerous materials removed from samples of 100 ml of the industrial waste solution. The results are summarized in the table below. Additive used Sample Size Sample Mean Sample STD A1 A2 A3 A4 5 16 1.6 7 16 1.4 4 20 1.7 11 1.5 Give your answers to three decimal places (example 45.543) 1) Compute the overall sample average 2) Fill in the Anova table below Source SS Treatment Error Total DF MS F 23.258 3) Find the critical value for the 0.05 significance level: 4) Is there any differences between the means amount of dangerous materials removed for the 4 additives? Answer: (yes/no) since FD is (greater/ smaller) than the critical value.