Four different processes for baking Oreo cookies are considered for the 2008 season. The cookies produced by each process are evaluated in terms of their

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Four different processes for baking Oreo cookies are considered for the 2008 season. The cookies produced by each process are evaluated in terms of their overall quality. Since the cookies sometimes may not bake correctly, the distribution of quality ratings is different from a normal distribution. When conducting a test of the quality of the four processes, cookies are blocked into groups of four according to the ingredients used. The ratings of the cookies baked by the four processes are as follows. (Ratings are on a scale of 0 to 100.) Are the four processes equally good? Explain.

Block Process1 Process 2 Process 3 Process 4 87 98 85 90 78 95 70 65 60 70 80 40 35 60 70 73 39 50 85 60 70 20 45 60 50 45 25 40 60 4 45