Help find SSTR

A random sample of five observations from three normally distributed populations produced the following data: (You may find it useful to reference the F table.) Treatments A B 28 25 27 22 19 23 20 15 26 15 20 20 37 CA - 23.2 T - 18.8 TO = 25.4 A = 13.2 $3 - 17.2 SC = 15.3 Click here for the Excel Data File a. Calculate the grand mean. (Round intermediate calculations to at least 4 decimal places and final answer to 4 decimal places.) Answer is complete and correct. Grand mean 22.4867 b. Calculate SSTR and MSTR. (Round intermediate calculations to at least 4 decimal places and final answers to 4 decimal places.) Answer is complete but not entirely correct. SSTR 2:0000 60 MISTR 68.4567 Next Type here to search O