Laserfiche WebLink
HYPOTHESIS TESTING APPROACHES <br />For formal hypothesis testing relative to Phase III Bond Release the following procedures were followed: <br />Cover and Production <br />Phase Ill Revegetation success for cover and production will be demonstrated by one of following statistical <br />approaches. <br />If sample adequacy has been achieved (minimum of 15 samples) in BRB -1 and the reference areas, and <br />the reclaimed area mean total allowable herbaceous cover and mean allowable herbaceous production are <br />above 90% of the reference area - derived standard, All criteria are met for a direct comparison and <br />revegetation would be deemed successful (CDMG 2005 revised rule, 4.15.11 (2)(a)). <br />Were the mean allowable herbaceous cover and /or production of the reclaimed area above 90% of the <br />reference area - derived standard, and sample adequacy was not met for the reference areas and /or BRB -1 <br />(minimum of 30 samples, technical standards not subject to sample adequacy), then the hypothesis of <br />reclamation success would be tested using a parametric test of the "reverse null" hypothesis. This would be <br />conducted using the following expression (CDMG 2005 revised rule, 4.15.11 (2)(c)). <br />1'— Q <br />5 - <br />Where: .z = Bond Release Block 1 Sample Mean <br />Q = 90% of standard <br />S_ = standard error of mean [s/ -] <br />S = sample standard deviation <br />n = sample size <br />t = calculated t value <br />t = table t value (alpha = 0.2) <br />The (reverse) null hypothesis being tested would be that the bond release block mean (t) was less than or <br />equal to 90% of the standard, stated as H µ 5 Q. If t was greater than the 1- tailed t table value for alpha <br />error probability of 0.20 and n -1 degrees of freedom then H would be rejected, and revegetation would be <br />deemed successful. <br />7 <br />