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p.promelas-Mountain Coal Co.-10/17/00 <br />ProgY'am run on 10-24-2000 at 09:28:42 <br />RESULTS CALCULATED USING THE BINOMINAL METHOD <br />--------------------------------------------- <br />CONC. NUMBER <br /> EXPOSED <br />------ <br />--- <br />--------- <br />100 -- <br />-- <br />-- <br />40 <br />75 40 <br />50 40 <br />25 40 <br />1.9 40 <br />NUMBER <br />DEAD <br />---------------------- <br />BINOMIAL <br />PROB. (PERCENT) <br />0 0.00 LESS THAN 0.001 <br />0 0.00 LESS THAN 0.001 <br />0 0.00 LESS THAN 0.001 <br />1 2.50 LESS THAN 0.001 <br />0 0.00 LESS THAN 0.001 <br />PERCENT <br />DEAD <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 TO>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 />