Random sampling from four normally distributed populations produced the following data: (You may find it useful to reference the E table.) A -10 -15 -18 Treatments B -17 -13 -12 Grand mean SSTR MSTR -6 -13 -4 -10 -15 Picture Click here for the Excel Data Eile a. Calculate the grand mean. (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.) -12 b. Calculate SSTR and MSTR. (Round final answers to 4 decimal places.)

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