Random sampling from four normally distributed populations produced the following data: (You may find it useful to reference the E table.) A -5 -9 -9 Treatments B -5 -17 -10 -15 Grand mean SSTR MSTR C -20 -13. -4 -17 -10 D -12 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.) -19 -16 -12.07 b. Calculate SSTR and MSTR. (Round final answers to 4 decimal places.)

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