Four real estate agents were asked to appraise the values of 10 houses in a particular neighborhood. The appraisals were expressed in thousands of dollars, with the results shown in the following...

Four real estate agents were asked to appraise the values of 10 houses in a particular neighborhood. The appraisals were expressed in thousands of dollars, with the results shown in the following table.



Source of Variation    Sum of Squares

Between agents               268
Between houses             1,152
Error                               2,352
a. Complete the analysis of variance table.
b. Test the null hypothesis that population mean assessments are the same for these four real estate agents.