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Table 2.2 -1. Reverse null T -Test on mean to demonstrate revegetation success for production and shrub density values. <br />Sample Parameters <br />Plant Production <br />(grams per 1/4 m <br />A,D&F Pits RSA&B <br />Shrub Density <br />(shrubs per 100 m <br />2010 2011 2010 2011 <br />Mean (Xbar) 56.6 95.1 32.7 36.3 <br />Standard Deviation (S) 31.8 55.7 39.0 33.4 <br />Standard Error (Sxbar) 5.81 10.16 7.12 6.10 <br />[S /(n) <br />Sample Size (n) 30 *1 30 •1 30 30 <br />Q = 90% of standard 14.04 *2 14.04 *2 8.89 *3 8.89 *3 <br />Table T Value = T 0.84 0.84 0.84 0.84 <br />(alpha = .20; df = 29 or 47) <br />Calculated T Value = T, 7.33 7.98 3.34 4.50 <br />T = Xbar - Q <br />Sxbar <br />• • <br />Note: If T, > than T then the null hypothesis (H is rejected and revegetation is deemed successful. <br />* Three clip plots per transect, thus 90 total samples collected. <br />*2 Actual standard = 62.39 grams per m {62.39 / 4 (sampled plots = grams per 1/4 m * 0.9 (90% of standard) = 14.04.} <br />*3 Actual standard = 400 shrubs per acre. {4051.1 m in an acre = .0987 shrubs /m * 100 m transect = 9.87 * 0.9 (90% of standard) = 8.89.} <br />