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• TABLE K-17 <br />ESTIiV1ATING ADEQUATE SAMPLE SIZE <br />n ~ 2Fs-zi? <br />min (d xl= <br />where nmin = minimum number of clipping quadrats to measure in this range <br />site or vegetation type, <br />s = sample standard deviation, <br />i = the z statistic )see table below), <br />d = amount of reduction it is desired to detect (see table below), <br />x = sample mean of production per quadrat, percent cover, <br />or density.. <br />z Statistic-aad-d Table <br />~ z d <br />Cover 1.28 0.1 <br />Productivity, grasslands 1.28 0.1 <br />Productivity, shrublands# 0.84 0.2 <br />Tree density 0.84 0.2 <br />i <br />°Grassland is defined as a vegetation type or range site where shrub <br />plus subshrub cover is less than 30 percent of the total vegetative <br />cover. <br />Shrubland is defined as a vegetation type or range site where shrub <br />plus subshrub cover is 30 percent or more of the total vegetative <br />cover. <br />• <br />K-49 <br />