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The following example fran Larson (1980) illustrates the procedure: <br /> <br />Vegetation Cover <br />~~ Control Affected <br />x. = 12.16 x. = 6.25 <br />~ 1 <br />n. = 60 n. = 30 <br />3 i <br />s2j = 10.25 s2i = 36.87 <br />m. = 59 x 10,25 = 604 m. = 29 x 36.87 = 1069 <br />J 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 /> <br /> <br />to > t95 hypott~sis rejected <br />-20- <br />