Laserfiche WebLink
t = Q - <br />x <br />S- <br />r <br />Where: x = Bond Release Block 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 = salculated t value <br />t = Table t value (alpha = 0.1) <br />The (traditional) null hypothesis being tested would be that the bond release block mean (i) was greater <br />than or equal to 90% of the standard, stated as H µ >_ Q. If t, was less than or equal to the 1- tailed t table <br />value for alpha error probability of 0.10, at (n -1) degrees of freedom, then H was not rejected, and <br />revegetation was deemed successful. <br />Species Diversity <br />For purposes of assessment of progress toward bond release standards, species diversity is judged using <br />the following four tests present in the provisions of the permit; success is demonstrated by passing the <br />first (A) and at least two of the remaining three (B, C, and D). <br />Mandatory Test A): No Overwhelming Dominant <br />No single plant species may exceed 60% relative cover. <br />Alternative Test B): Total Species Density Test <br />In this test, overall reclamation diversity standard is judged based on the species density values observed <br />along with cover sampling in 100 sq.m. sample plots. Species density numbers are subjected to sample <br />adequacy assessment in the usual manner. <br />For purpose of establishing the range of species density within the reference areas, the 75% range of <br />variation is established as: <br />zxs <br />Where: z = the number of standard deviations (both ways from the mean) <br />encompassing 75% of the normal distribution (= 1.15; see Rohlf and Sokal 1969, <br />Table P) <br />s = standard deviation (n -1) <br />8 <br />