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SAGEBRUSH TYPE, MINE AREA, t-TEST COMPARISONS <br /> <br />n <br />x Degrees of <br />Freedom <br />s <br />t <br />.OS <br />Pooled s <br />Pooled t <br />t calc <br />HERBACEOUS COVER <br />1. Reference 21 15.4 20 12. 74 2 .09 <br />2. Study 33 10.3 32 9. 98 2 .04 3 .23 2. 07 1.58 <br />TOTAL PLANT COVER <br />1. Reference 21 83.5 20 18. 41 2 .09 5 .21 2. 06 3.41 <br />2. Study 33 65.5 32 19. 65 2 .04 <br />HERBACEOUS PRODUCTIVITY <br />1. Reference 16 33.33 15 15 .37 2 .13 5 .95 2. 14 1.13 <br />2. Study 15 26.6 14 17 .61 2 .15 <br />SHRUB PRODUCTIVITY <br />1. Reference 16 257.6 15 143 .49 2 .13 41 .35 2. 13 2.11 <br />2. Study 15 170.4 14 79 .68 2 .15 <br />TOTAL PRODUCTIVITY (SHRUB AND HERB) <br />1. Reference 16 290.0 15 146 .34 2 .13 42 .26 2. 13 2.20 <br />2. Study 15 196.9 14 81 .96 2 .15 <br />SHRUB pENSiTY <br />1. Reference 25 5.12 24 1 .20 2 .06 -33 2. 06 2.93 <br />2. Study 26 4.15 25 1 .16 2 .06 <br />