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Wyoming Fuel, 8505-087-135 ' <br />possible, using an IBM compatible personal computer and software <br />(USEPA 1985> which utilized the following statistical methods: <br />moving average, probit, and binomial probability. The method <br />selected for reporting the test results was determined by the <br />characteristics of the data, i.e., the presence or absence of 0 <br />and 100 percent mortality and the number of concentrations in <br />which partial mortality had occurred (Stephan 1977). Dunnett's <br />multiple comparison test (with aresine squareroot transformation) <br />was also utilized to compare treatment mortality with control <br />mortality. The NOEC was determined by the highest effluent <br />concentration which produced no significant mortality as compared <br />to the control. <br />+. <br />8 <br />