Random sampling from four normally distributed populations produced the following data: (You may find it useful to reference the Ftable.) Treatments A B C -5 -4 -16 -4 -15 -17 -20 -10 -8 -14 -4 -12 -5 -15 -11 picture Click here for the Excel Data File a. Calculate the grand mean. (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.) Grand mean

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