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i <br />' <br />p.promelas-Mountain Coal <br />Co.-5/2/00 <br /> Program run on 05-08-2000 at 08:05:39 <br />i <br />C RESULTS <br />- CALCULATED USING <br />---- THE BINOMINAL <br />-- <br />--------- METHOD <br />---- <br /> ------- <br />CONC. ------------- <br />NUMBER - <br />-- <br />NUMBER ----- <br />---- <br />PERCENT ------------- <br />BINOMIAL ------- <br /> EXPOSED DEAD DEAD PROB .(PERCENT) <br /> 100 40 0 0.00 LESS THAN 0.001 <br /> 75 40 0 0.00 LESS THAN 0.001 <br /> 50 40 0 0.00 LESS THAN 0.001 <br /> 25 40 0 0.00 LESS THAN 0.001 <br />.~i 1.9 40 1 2.50 LESS THAN 0.001 <br />AT A CONFIDENCE LEVEL OF 95 PERCENT, THE BINOMIAL TEST <br />SHOWS THAT THE LC50 IS ABOVE 100 <br />•- THE USEFULNESS OF ANY LC50 CALCULATED FROM THIS SET OF DATA <br />IS QUESTIONABLE BECAUSE A CONCENTRATION-EFFECT RELATIONSHIP <br />HAS NOT BEEN DEMONSTRATED OVER A REASONABLE RANGE (e.g. <br /><37 T0>63 OF PERCENT DEAD <br />NEITHER THE APPROXIMATE LC50 CALCULATION NOR THE MOVING <br />AVERAGE METHOD CAN BE USED WITH THIS SET OF DATA. <br />EITHER THE HIGHEST CONCENTRATION KILLED LESS THAN 50 <br />PERCENT OR THE LOWEST KILLED MORE THAN 50 PERCENT. <br />IF THE PROBIT SLOPE IS NEGATIVE, ENTER THE DATA AGAIN <br />USING THE NUMBER ALIVE INSTEAD OF THE NUMBER DEAD. <br />'~ WHEN THERE ARE LESS THAN TWO DIFFERENT CONCENTRATIONS AT <br />WHICH THE PERCENT DEAD IS BETWEEN 0 AND 100, THE PROBIT <br />METHOD CANNOT GIVE ANY STATISTICALLY SOUND RESULTS. <br />COMPARE RESULTS WITH ORIGINAL DATA TO SEE IF THEY ARE <br />' REASONABLE. <br /> <br />4 <br />