S3 = (S2 / r)1/2

 = (MSE / r)1/2
 = (.0179 / 2)1/2,

 = 0.0946

Then, a summary for the test is shown by calculating the
mean separation. First the treatments are listed in order
of decreasing means.

 Treatment kg/plot
 R 8.7 a
 tp

 x 7.0 b
 tp nitrogen

 x 6.7 be
 tp plant density

 x 6.55 c
 tp variety 6.55 c

 Each Rp value is compared to the observed difference
between two means. Here it is important to take into
consideration the range of number of means involved.
For example, to compare xtp with xtpv calculate
8.7 6.55 = 2.15. This is compared to Rp = 4.26, which
would be in the column p = 4, because Xtp-variety is the
fourth mean in the range starting at Xtp. The mean
separation is shown above.
 The results of this test show that the "tech pack"
treatment is significantly different from the other three
treatments (95% level of probability). This means that
the lack of any of the three factors that form the "tech
pack" will cause a significant reduction in the yield of
maize under the conditions of this trial.