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s L /~`2 Sh <br />// <br />(\\\\ A <br />nh <br /> <br />Where Yvt - Neighted value <br />Yh -Value in type h <br />ah -Acreage in type h <br />A - Acreage of entire combined area (- L ah) <br />5 - Standard deviation for entire combined area <br />Sh2 - Variance of type h <br />nh -Number of samples taken in type h <br />i~ <br />Cover and productivity on the reclaimed sites will be considered to be <br />successful if they are at least 90 percent of the values of the reference <br />area with 80 percent statistical confidence. If cover and productivity <br />values on the reclaimed area exceed 90 percent of the values of the <br />reference area, no additional calculations are necessary to do~v went teve- <br />getation success for cover and productivity. If the values for the <br />reclaimed area are less than the standards from the reference area, <br />hypothesis must be developed and statistical tests must be tun to determine <br />the success or failure of revegetation efforts. Hypothesis to be tested <br />and procedures are as follows from Larson (1980): <br />Ao: Revegetated area > reference area standard <br />Ra: Revegetated area < reference area standard <br />t - test comparison: <br />xl-x2 <br />to - <br />SZ + SZ <br />nl ny <br />Where to -Calculated estimate of t <br />i,-. <br /> <br />38-37 <br />