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TABLE 9-1. BASIC STATISTIL^L TERMINOLOGY APPLICABLE TO SAMPLING PLANS FOR SOLID WASTES <br /> Terminology Symbol Mathematical equation (Equation) <br /> • Variable (e.g., barium x <br /> or endrin) <br /> • Individual measurement xi <br /> of variable <br /> N <br /> Ex <br /> • Mean of all possible p p =1i , with N = number of (i) <br /> measurements of variable possible measurements <br /> (population mean) <br /> • Mean of measurements R Simple random sam lin and <br /> ?enerated by sample s stemat c ran om sam in <br /> sample mean) <br /> n <br /> Ex <br /> 1 <br /> x` = i=n , with n = number of (2a) <br /> sample measurements <br /> Stratified random sampling <br /> r <br /> x = E WkzkI with xk = stratum (2b) <br /> k=1 mean and Wk = frac- <br /> tion of population <br /> represented by Stratum <br /> k (number of strata <br /> [k] range from 1 to r) <br /> • Variance of sample s2 Simple random SaWling and <br /> systematic ran om samplina <br /> T x, - (E xi)2A <br /> s2 = 1=1 1=1 <br /> n - 1 (3a) <br /> Stratified random sam 11n <br /> r <br /> s2 = E Wksk , with s2 ■ stratum (3b) <br /> k=1 varian�e and W - <br /> fraction of population <br /> represent by Stratum k <br /> (number of strata k] <br /> ranges from 1 to r <br /> NINE -- 2 <br /> Revision 0 <br /> Date ate ernTi r^ 586 <br />