Document KRBQ917aw528qoVOQ3OMoGZBo

Filling Station Ethyl 1927 - 1929 Lead in Urine rags./Liter Mgs. Pb per 1929 liter urine f X fx fx2 .0 - .039 .04 ~ .079 .08 - .119 .12 - .159 .16 - .199 .20 - .239 .24 - .279 .28 - .519 .32 - .359 .36 - .599 .40 - .439 .44 - 70 71 92 05 1 .4 15 06 07 08 09 0 10 1 11 26 00 77 18 36 00 4 16 5 25 00 00 00 00 00 11 121 45 205 Mgs,, Pb per 1927 liter urine f X fx fx2 .0 .04 .03 -- .12 .3.6 .20 -- .24 -- .28 -- .32 -- .36 -- .40 -- .44 -- .039 .079 .119 .159 .199 .239 .279 .319 .559 .399 .439 30 91 62 33 14 25 06 07 08 09 0 10 2 11 26 00 99 12 24 9 27 4 16 10 50 00 00 00 00 ,0 0 22 242 66 368 Nil, = -- = 1.730769 26 Hui = - 2.558461 1 26 Nu2 = 25 = 7.884615 * 26 Ku2 = 368 _ 14.155846 2 26 (Uax)2 = 2.995561 (Hux)2 = 6.443784 Pi2 = 4.889054 Pi2 = 7.710062 Sigma P *E *sii 2.211121 x .04 = .088445 mgs. .67449 x .088445 = .059655 _ + .008277 7.211102 " Sigma = 2.776700 x .04 = .111063 mgs. .67449 x .111068 P.E. . = sig. sfsF = T S = * -010589 mean = 1.730769 x .04 + .02 mean = 2.558461 x .04 + .02 = .089231 mgs./liter .121538 mgs./liter P.E._ = .-Q59655 = .011699 m 5.099019 P.E. m _*0749ii = .014692 5.099019 mean = .089 .012 mgs./liter mean .122 .015 mgs./liter S.D. = .088 .008 mgs. S.D. = .111 + .010 mgs. Test of Difference mean 1927 = .122 mean 1929 = .089 Diff. = .053 p.E.dif. = 4(.0T5)2,.+ (.015p = 4 *000144 + .000225 = sf.000369 = ,.019 Diff. - .055 - 1>7 P.E.iifi> .019 ` There is a decrease in lead mg./liter of urine in 1929 as compared to 192? hut this is not significant. There is some importance to be attached to the fact that in all findings the difference is always in favor of 1929. * Filling Station Ethyl 1927 - 1929 Lead in Urine (Total) Pb in urine TfigS 1927 f,X fx .0 - .059 .04 - .079 .08 - .13.9 .12 - .159 .16 - .199 .20 - .259 .24 - .279 .28 - .519 .52 ~ .559 .36 - .399 .40 - .439 .44 - .479 .48 - .519 .52 - 20 01 62 93 44 35 06 07 08 09 0 10 0n 0 12 2- 13 26 0 0 12 27 16 15 0 0 0 0 0 0 0 26 96 Nux = 2SL = 5.692508 26 Nu 2.= S2 _ 2 2 .384615 26 15.633138 fx2 0 0 24 81 64 75 0 0 0 0 0 0 0 338 582 Pb in urine mgs. .0 - .039 .04 - .079 .08 - .119 .12 - .159 .16 - .199 .20 - .239 .24 - .279 .28 - f 5 8 6 2 1 3 0 1 26 1929 X fx 00 18 2 12 36 44 5 15 60 77 52 = | | = 2.000000 - Nua = = 7.307692 26 (Hux)2 = 4.000000 fx2 0 8 24 18 16 75 0 49 190 HS N II pi2 = 8.751477 Sigma = 2.958290 x .04 = .118332 mgs. .67449 x .118332 P.E.sig. = J%S T = .011068 .079814 7 .211102 Pi2 = 5.507692 Sigma = 1.818706 x .04 = .072748 mgs P.E.sig. = .67449 x .0727.48 _ .049068 i52 7.211102 " .006805 mean = 3.692308 x .04 + .02 = .187692 mgs. Pb : P.E.jj -- .079814 _ .079814 _ .015653 J26 5.099019 mean = .188 .016 mgs. Pb mean = 2.000000 x .04 + .02 = .100000 P.E.m = .049068 _ + ,309623 5.099019 mean = .100 .010 S.D. = .118 .011 mgs. S.D. = .073 .007 Test of Difference mean 1927 = .188 mean 1929 = .100 Diff. = .088 p *E *dif. = 'I(.016)2 + (.010): = -4.000256 + .000100 = 4.000556 Diff. _.088 _ 4.6 P.E.rjjf^ .019 There is a decrease in total lead for 1929 as compared to 1927 and this decrease is verging onto significance being slightly more than four times its own probable error. Filling Station Ethyl 1927 - 1929 Lead in Faeces mgs./gm. Ash igs. Pb per 1929 9 gm. ash f X fx fx Mgs. Pb per 1927 gm. ash f X fx fx2 ,0 - .059 ,04 - .079 ,08 - .11^ .12 - .159 ,16 - .199 ,20 -r .259 ,24 - 1 f 6 3 1 1 1, 20 0 '1 2 5 4 5 6 00 7 7. 12 24 9 27 4 16 5 25 6 56 45 135 .0 - .059 .04 - .079 .08 - .119 .12 - .159 .16 - .199 .20 - .259 .24 - .279 .28 - .519 .52 - .559 .56 - .599 .40 - .459 .44 - .479 .48 - 20 51 52 23 14 05 16 17 08 09 1 10 0 11 1 12 19 00 55 10 20 6 18 4 16 00 6 56 7 49 00 00 10 ICO 00 12 144 60 388 = 2.150000 Nux = | | = 5.157894 H 1 d |os Hu = = 6.750000 2 20 (Nux)2 = 4.622500 Pi2 = 2.127500 Sigma = 1.458595 x .04 = .058544 mgs. P E = .67449 x .058544 - .05955S * *sig* ^4u" 6.524555 = .006222 mean = 2.150000 x .04 + .02 = .106000 mgs./gm. ash P .E.a .059552 = .008799 4.472155 mean = .106 .009 mgs./gm. ash KU = 588 _ 20.421052 (Nux)2 = 9.972295 Pi2 = 10.448757 Sigma = 5.252450 x .04 = .129298 mgs. P E = 67449 x .129298 _ .087210 ` *siS* 6.164414 6.164414 = .014147 mean = 5.157894 x .04 + .02 P.E.m .146516 mgs./gm. ash .087210 _ + ,020007 4.558898 " mean = .146 .020 mgs./gm. ash S.D. = .058 .006 mgs. S.D. = .129 .014 mgs. Test of Difference mean 1927 = .146 mean 1929 = .106 Diff. = .040 P .E .d if. = J(.0 0 9 >* + (.0 2 0 ) = j.000081 + .000400 Diff.. _ .040 y 1 P.E.dif. .022 There is no significant difference between 1927 and 1929 for lead in faeces mgs./gm. ash. = J .000481 filling Station Ethyl 1927 - 1929 Pb in Faeces (Total) 1927 1929 Pb in faeces mgs. (excluding case no. 4) f X fx fx2 Pb in faeces mgs. f X fx fx2 .0 - .079 1 0 .08 - .159 6 1 .16 - .259 2 2 .24 - .519 5 5 .52 - .599 2 4 .40 - .479 1 5 .48 - .559 0 6 .56 - .659 2 7 .64 - .719 1 8 .72 - .799 0 9 .80 , .879 0 10 .88 - .959 0 11 .96 -1.Q&& 0 12 1.C4 - 1 15 19 00 66 48 9 27' 8 52 5 25 00 14 98 8 64 00 00 00 00 15 169 67 429 .0 - .079 5 0 0 0 .08 - .159 .5 1 5 5 .16 - .259 8 2 16 52 .24 - .519 0 5 0 0 .52 - .599 5 4 12 48 .40 - .479 1 5 5 25 .48 - .559 1 6 6 56 .56 - 17 7 49 20 49 195 Nu-, = Z. = 3.526316 1 19 Nu-, = 49 _ 2.450000 1 20 Nu2 = MIL = 22.578947 2 19 Nu = isL = 9.650000 2 20 (NUi)2 = 12.454905 (Nux)2 = 6.002500 Pi2 = 10.144042 Pi2 = 5.647500 Sigma = 5.184971 x .08 = .254798 mgs. Pb v _ _ .67449 x .254798 _ .171859 6.164414 Sigma = 1.909842 x .08 = .152787 mgs. v v - 67449.x .152787 _ .105055 r.asig. 6.524555 = + .027879 = + .016294 mean = 5.526516 x .08 + .04 = .522105 mgs. Pb .171859 .171859 p *E *m - FIs' 4.558898 .059427 mean = .522 .059 mean = 2.45 x .08 + .04 = .1960 + .04 = .256000 mgs. Pb .105055 p *E * m - fHT .105055 = .025045 4.472155 mean = .256 .025 S.D. = .255 + .028 mgs. Pb S.D. = .155 + .016 Test of Difference mean 1927 = .522 mean 1929 = .256 Diff. = .086 Diff. = .086 y 4 P - E - i f . *026 p -E -dif. - yn5S)2 + (.025)2 = r.0152l + .000529 = ^7000681 Although there is a decrease in total lead for 1929 as compared to 1927, the difference is not statistically significant.