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ASPEN TYPE, MINE AREA, t-TEST COMPARISONS <br /> <br />n <br />x Degrees of <br />Freedom <br />s <br />t .OS <br />Pooled s <br />Pooled t <br />t calc <br />HERBACEOUS COVER <br />1. Reference 40 65. 8 39 23.85 2.02 <br />2. Study 45 31. 7 44 19.45 2.01 4.76 2. 02 7,17 <br />TOTAL PLANT COVER <br />1. Reference 40 87. 3 39 34.23 2.02 <br />2. Study 45 67. 1 44 24.45 2.01 6.52 2. 02 3.09 <br />HERBACEOUS PRODUCTIVITY <br />1. Reference 25 96. 7 24 45.77 2.06 <br /> <br />2. Study <br />15 <br />61. <br />9 <br />14 <br />26.82 <br />2.15 <br />11.48 2, 08 3.03 <br />TOTAL PRODUCTIVITY (SHRUB fi HERB) <br />1. Reference 25 108. 5 24 50.19 2.06 <br />2. Study 15 100. 0 14 55.85 2.15 17.57 2 .11 .48 <br />SHRUB DENSITY <br />1. Reference 26 3. 46 25 1.42 2.06 <br />2. Study 25 5. 12 24 1.17 2.06 .36 2 .06 -4.56 <br />