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p.promelas-Bear Coal Co.-12/18/97 <br />Program run on 12-23-1997 at 08:18:19 <br />RESULTS CALCULATED USING THE BINOMINAL METHOD <br />------------------------------------------------------- <br />CONC. NUMBER NUMBER PERCENT ------------------------- <br />BINOMIAL <br />EXPOSED DERD DEAD <br />------------------------------- <br />- PROB. (PERCENT) <br />-- <br />------------------- <br />- <br />---------------------- <br />100 20 3 15.00 --- <br />- <br />0.1288 <br />75 20 2 10.00 0.0201 <br />50 20 0 0.00 LESS THAN 0.001 <br />25 20 0 0.00 LESS THAN 0.001 <br />1.7 20 1 5.00 0.0020 <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 RELATION SHIP <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 />RESULTS CALCULATED USING THE PROBIT METHOD <br /> GOODNESS OF FIT <br />ITERATIONS G H CHI-SQUARE PROBABILITY <br />5 5.757 1.000 4.668 0.198 <br />SLOPE _ .311127 <br />95 PERCENT CONFIDENCE LIMITS = -.4353862 AND 1.05764 <br />LC50 = 3380929 <br />95 PERCENT CONFIDENCE LIMITS = 938.0842 AND + INFINITY <br />LCl = .1127262 <br />95 PERCENT CONFIDENCE LIMITS = D AND 9.585987 <br />COMPARE RES ULTS WITH ORIGINAL DATA TO SEE IF THEY ARE <br />REASONABLE. <br />COMMERCIALTESTING & ENGINEERING CO, <br />F-466 ~~~ <br />flnnin a Watermark rrt Fnr ~••~v Prn tnrhnn <br />