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48 Hour Acute WET - Ceriodaphnia dubia <br />Program run on 01-18-2006 at 14:21:28 <br />p°SULTS CALCULATED USING THE BINOMINAL METHOD <br />CONC. NUMBER NUMBER PERCENT BINOMIAL <br /> EXPOSED DEAD <br />--- <br />----- <br />- DEAD <br />---- <br />----- PROB.(PERCF.NT) <br />-- <br />--------- <br />100 --------------- <br />20 - <br />-- <br />-- <br />3 --- <br />--- <br />15.00 -- <br />----------------------- <br />0.1288 <br />75 20 0 0.00 LESS THAN 0.001 <br />50 20 1 5.00 0.0020 <br />25 20 0 0.00 LESS THAN 0.001 <br />12.5 20 0 0.00 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 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 />----------- ------------------- ------------------ -------------------------------- <br />GOODNESS OF FIT <br />ITERATIONS <br />----------- G <br />------------------- H <br />------------------ CHI-SQUARE PROBABILITY <br />- <br /> <br />5 <br />1.650 <br />1.000 ------------------------------- <br />2.367 0.500 <br />SLOPE = 2.719442 <br />95 PERCENT CONFIDENCE LIMITS = -.7740703 AND 6.212954 <br />LC50 = 276.8324 <br />95 PERCENT CONFIDENCE LIMITS = 128.2243 AND + INFINITY <br />LCl = 38.61749 <br />95 PERCENT CONFIDENCE LIMITS = 0 AND 63.39125 <br />COMPARE RESULTS WITH ORIGINAL DATA TO SEE IF THEY ARE <br />REASONABLE. <br />~~ <br />