Laserfiche WebLink
In the development of the cover performance standard here, we use 15.12 (the highest possible value <br />with 90% confidence) as the value for the Mountain Brush Reference Area to be taken forward into the <br />weighting formula prescribed in the permit. <br />[`The upper and lower limits of the 90% confidence range for the mean can be calculated in either of two <br />ways: <br />1) Confidence Intervals <br />5.10 <br />C.I. = - *t = 15 *1.761= 2.3189 <br />12.80 - 2.32 =10.48 <br />12.80 + 2.32 = 15.12 <br />s <br />N — d1 5 2 <br />2) Sample Adequacy Expression <br />s 5.10 1.761 <br />d = — <br />x 12.80 15 <br />= 0.1812 <br />▪ — 12.80 — (12.8007.1812) =10.48 <br />▪ + d = 12.80 + (12.80 * 0.1812) = 15.12 <br />Note in the above expressions, two- tailed t- values with n -1 degrees of freedom are used. We are <br />concerning ourselves with the full range of possible values for mean, thus bi- directional concerns are <br />evident. From the CDRMS point of view this pushes the limits out further and produces the highest <br />maximum value for the mean (at 90% confidence).] <br />It is our assertion that the above approach of taking the highest possible value of the mean as the <br />standard for the Mountain Brush Reference Area protects the interest of the State by using the most <br />13 <br />