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c.dubia-Bear Coal Co.-12/18/97 Program run on 12-23-1997 at 08:20:17 RESULTS CALCULATED USING THE BINOMINAL METHOD CONC. NUMBER NUMBER PERCENT BINOMIAL ---- ---- EXPOSED ---- --- DEAD - DEAD PROB. (PERCENT) - 100 --- ------ 20 ------------ 20 --------------- 100.00 --------------------------- LESS THAN 0.001 75 20 6 30.00 5.7659 50 20 4 20.00 0.5909 25 20 1 5.00 0.0020 1.7 20 2 10.00 0.0201 THE BINOMIAL TEST SHOWS THAT 50 AND 100 CAN BE USED AS STATISTICALLY SOUND CONSERVATIVE 95 PERCENT CONFIDENCE LIMITS BECAUSE THE ACTUAL CONFIDENCE LEVEL ASSOCIATED WITH THESE LIMITS IS GREATER THAN 95 PERCENT AN APPROXIMATE LC50 OF 80.00702 IS OBTAINED BY NONLINEAR INTERPOLATION BETWEEN 75 AND 100 RESULTS CALCULATED USING THE MOVING AVERAGE METHOD SPAN G LC50 95 PERCENT CONFIDENCE LIMITS ---------- 4 ---------------- 0.053 ----------------- 62.492 ---------------- 54.295 --------------------- 73.056 3 0.057 67.423 60.281 76.224 2 0.098 73.090 66.248 80.703 AN LC50 CALCULATED USING THE MOVING AVERAGE METHOD MAY NOT BE A VERY GOOD ESTIMATE IF THE SPAN IS MUCH LESS THAN THE NUMBER OF CONCENTRATIONS. IF ANY HIGHER CONCENTRATION PRODUCES A LOWER PERCENT DEAD THAN ALOWER CONCENTRATION, THE CONFIDENCE LIMIT AS OBTAINED BY THE MOVING AVERAGE METHOD WILL PROBABLY BE T00 CLOSE. RESULTS CALCULATED USING THE PROBIT METHOD -------------------------------------------------------------------------------- GOODNESS OF FIT ITERATIONS G H CHI-SQUARE PROBABILITY -------------------------------------------------------------------------------- 6 10.133 11.221 33.664 LESS THAN 0.001 BECAUSE THE PROBABILITY IS LESS THAN 0.05, RESULTS CALCULATED USING THE PROBIT METHOD PROBABLY SHOULD NOT BE USED. SLOPE = 1.192828 95 PERCENT CONFIDENCE LIMITS = -2.604307 AND 4.989964 LC50 = 85.52594 95 PERCENT CONFIDENCE LIMITS = 0 AND +INFINITY LC1 = .9590901 95 PERCENT CONFIDENCE LIMITS = 0 AND 27.75393 COMPARE RESULTS WITH OR CC;HJU1VHt5L~ . F-466 L^~ Original Watermmked For VOOr Protection