Check my work mode : This shows what is correct or Incorrect for the work you have completed so f 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 22 19 20 15 30 26 15 20 27 In 23.2 TH - 18.8 TO = 25.4 SA = 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 0 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 30 3800 6 MSTR 65.4667 0