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The following example from Larson (1980) illustrates the procedure: <br />Vegetation Cover <br />~ Control Affected <br />xj = 12.16 xi = 6.25 <br />nj = 60 ni = 30 <br />s2. = 10.25 s2. = 36.87 <br />] i <br />m. = 59 x 10.25 = 604 m. = 29 x 36.87 = 1069 <br />7 i <br />s 2 = 604 + 1069 = 19.01 <br />p 88 <br />t - 12.16 - 6.25 - 5,91 = 6.06 <br />e 19.01 60 + 30 .975 <br />(60) (30)) <br />t95 = 2.631 <br />• to > t95 hypothesis rejected <br />l <br /> <br />-zo- <br />