To test whether the mean time needed to mix a batch of material is the same for machines produced by three manufacturers, Acti-Chem SA (Pty) Ltd obtained the below data on the time (in minutes) needed...

Extracted text: To test whether the mean time needed to mix a batch of material is the same for machines produced by three manufacturers, Acti-Chem SA (Pty) Ltd obtained the below data on the time (in minutes) needed to mix the material. Use the data, and summarized information, to test whether the population mean times for mixing a batch of material differ for the three manufacturers. Use a=0.05. Manufacturer 1 (20; 26; 24; 22). Manufacturer 2 (28; 26; 31; 27). Manufacturer 3 (20; 19; 23; 22). Furthermore, the following sums of squares are given: SST = 104; SSE = 44 and TSS = 148. What is the critical value (rounded off to two decimals)? O A. 4.01 O B. 4.90 O C. 4.67 O D. 4.26