SStot = [(8.6)2 +...+ (7.0)2] CF
 = 6.17875

 SSE = SStot (SSB + SST)
 = 6.17875 (0.21125 + 5.91375)
 = 0.05375

 The highly significant effect among treatments
indicates that a mean separation test should be performed
to look for statistical differences. For this specific
case Duncan's New Multiple Range test (Little and Hills,
1978; Steel and Torrie, 1980) is used.
 First start by computing least significant ranges
 (Rp) by the following formula:

 Rp = qaSR

where qa = significant "studentized" ranges taken from a
table (Steel and Torrie, 1980).

 a = level of significance (.05)
 p = number of treatment means involved in the
 comparison
 = 2,3,4

 The values are summarized below:
 P
 2 3 4
 q.05(p,3df) 4.50 4.50 4.50
 and Rp is 0.426 0.426 0.426

NOTE: the values for qa in the table (see Steel and
Torrie, p. 586) are taken for
 p = 2, 3, 4 and
 d.f. = 3

The values for Rp were calculated by using the formula
previously shown, where