Answer Happy

An experiment is proposed to determine the effect of phosphate
on rice production.  Accordingly, an agronomist prepared
five compositions of phosphate. Six test specimens were made for
each composite.  The yields in kg of the thirty test
specimens were determined and coded as shown below.
                                                 
                                                 1
                                                 2
              Composition               3
                                                 4
                                                 5
                        Yield
     16     18     30     32    23     25
     25     28     39     38    36     29
     36     32     40     44    36     40
     38     36     39     43    40     38
     33     36     40     40    34     41
(a).   State the
relevant model completely.
(b).   Estimate the
mean effect of each composition.
(c).   At 5% level of significance, is there any
difference in the yield of each