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3. (25 points) A pharmaceutical manufacturer wants to investigate the bioactivity of a new drug. A completely randomized single-factor experiment was conducted with three dosage levels, and the following results were obtained. Treatment (Dosage) Observations 20g 27 29 31 27g 25 28 28 40g 33 36 33 Use these data to perform an analysis of variance to determine whether there are differences among mean values for the three treatment groups. (Show all necessary details) Use a = 0.01.