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i <br />Photographic Record <br />Within each reclamation and reference area, representative color photographs were taken to <br />i document the appearance of the vegetation in 1996. Within each photo, a placard identifies the <br />particular reclamation area being illustrated. <br />~ Statistical Methods <br />Sample adequacy calculations were carried out using the formula as prescribed by CMLRB <br />(1988): <br />~ t2 s2 <br />~ Nmin = __ <br />I d2 x2 <br />~ where: <br />Ii t = two-tailed t-value with n-1 degrees of freedom <br />~ s2 = sample variance (based sn_1) <br />d = 0.1 (level of precision or desired detectable reduction) <br />x =sample mean <br /> <br />For the two-stage sampling of shrub density, calculation of sample variance for use in the above • <br />sample adequacy formula was as follows (expression 10.10 of Cochran 1963): <br />I ~ 1_fi 1_f2 , <br />' ~ Vy S12 + Sp2 <br />i n mn <br />I where: <br />Vy Overall variance of shrub density data <br />f1 = n/N <br />fp = m/M <br />S12 = variance among primary unit means <br />• <br />6 <br />