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Filling Station Ethyl 1927 - 1929 Lead in Urine rags./Liter 11 rl II ii H CM Mgs. Pb per 1929 liter urine f X fx .0 - .059 .04 - .079 .08 - .119 .12 - .159 .16 - .199 .20 - .239 .24 - .279 .28 - .519 .32 - .359 .36 - .599 .40 - .439 .44 70 71 92 03 1 .4 15 06 07 08 09 0 10 1 11 26 45 26 .= 1. 730769 0 7 18 0 4 5 0 0 0 0 0 11 45 205 = 7 .884615 26 (Uax)2 = 2.995561 fx2 0 7 36 0 16 25 0 0 0 0 0 121 205 Mgs. Pb per 1927 liter urine f x fx .0 - .039 .04 - .079 .03 - .119 .12 - .159 .3.6 - .199 .20 - .239 .24 - .279 .28 - .319 .32 - .359 .36 - .399 .40 - .439 .44 -- 30 91 62 33 14 25 06 07 08 09 0 10 2 11 26 0 9 12 9 4 10 0 0 0 0 .0 22 66 66 _ .558461 26 Nu 2 = 368 _ 14.153846 26 (Hux)2 = 6.445784 fx2 0 9 24 27 16 50 0 0 0 0 0 242 368 Pi* = 4.889054 Sigma = 2.211121 x .04 = .088445 mgs. _ .67449 x .088445 P*E*si = .059655 _ + .008277 7.211102 " mean = 1.730769 x .04 + .02 = .089231 mgs./liter P.E._ = .-Q59655 = .011699 m 5.099019 mean = .089 .012 mgs./liter Pi2 = 7.710062 Sigma = 2.776700 x .04 = .111063 mgs. P.E. s.ig. .67449 x .111068 = Ttifil= * -010589 mean = 2.558461 x .04 + .02 .121538 mgs./liter P.I m -*074914 = .014692 5.099019 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(.dK)8:+ (.015)2 = 4.000144 + .000225 = J7o003S9 001909? = ..019 Diff. - .055 - 1>? P.E.iifi> .019 (over) 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. c KF 0019098 Filling Station Ethyl 1927 - 1929 Lead in Urine (Total) Pb in urine mgs. 1927 f, X f=c fx2 Pb in urine 1929 mgs. f X fx .0 - .059 .04 - .079 .08 - .11.9 .12 - .159 .16 - .199 .20 - .239 .24 - .279 .28 - .319 .32 ~ .359 .36 - .599 .40 - .439 .44 - .479 .48 - .519 .52 - 20 01 62 93 44 35 06 07 08 09 0 10 0n 0 12 2- 13 2c 0 0 12 27 16 15 0 0 0 0 0 0 0 26 96 \ --0 s? H !1 96 .= 3.692508 26 Nug = 582 = 22 .384615 26 0 0 24 81 64 75 0 0 0 0 0 0 0 338 582 .0 - .039 50 0 .04 - .079 81 8 .08 - .119 6 2 12 .12 - .159 23 6 .16 - .199 14 4 .20 - .239 3 5 15 .24 - .279 06 0 .28 - 17 7 i 16 52 Kux = 52 .= 2 .000000 26 " Hug = 190 = 7.307692 26 (Nuj.)2 = 15.655138 (Nux)2 = 4.000000 fx2 0 8 24 18 16 75 0 49 190 Pi = 8.751477 Sigma = 2.958290 x .04 = .118352 mgs. P.E.sig. - .67449 x .118552 [ST .079814 7.211102 = .011068 Pig = 5.507692 Sigma = 1.818706 x .04 = .072748 mgs. P.E.sig. - .67449 x .072743 4 52 _ .049063 7.211102 = + .006805 mean = 3.692308 x .04 + .02 = .187692 mgs. Pb p tE?-,n --" .0/9814 --' 5..0079998M154 _"_* -015665 mean = 2.000000 x .04 + .02 = .100000 p-E-" = dlig=* -0096!:5 mean = .188 .016 mgs. Pb mean = .100 + .010 S.D. = .118 + .011 mgs. S.D. = .073 .007 Test of Difference mean 1927 = .188 mean 1929 = .100 Diff. = .088 Diff. _.088 4.6 P.E.r^f^ .019 P.E.dif. = (.016)2 + (.010)' There is a decrease in total lead for 1929 as compared to 1927 and this = -4-000256 + .000100 decrease is verging onto significance = 4.000556 being slightly more than four times its own probable error. = .018868 0019099 Filling Station Ethyl 1927 - 1929 Lead in Faeces mgs./gm. Ash Mgs. Pb per gm. ash ,0 - .059 .04 - .079 .08 - .llSf .12 - .159 .16 - .199 .20 -r .239 .24 - f 1 7 6 3 1 1 1 20 1929 X fx 00 17 2 12 39 44 55 66 43 fx2 0 7. 24 27 16 25 56 135 Nux = ~ == 2.150000 1 20 Ku2 = 6.750000 2 20 Mgs. Pb per 1927 gra. ash f X fx .0 - .039 .04 - .079 .08 - .119 .12 - .159 .16 - .199 .20 - .259 .24 - .279 .28 - .319 .32 - .359 .56 - .399 .40 - .439 .44 - .479 .48 - 20 51 52 23 14 05 16 17 08 09 1 10 0 11 1 12 19 Nux = 60 19 _ , 3 .157894 0 5 10 6 4 0 6 7 0 0 10 0 12 60 ll (V 1 588 _ 20.421052 19 fx2 0 5 20 18 16 0 56 49 0 0 ICO 0 144 388 (Nux) = 4.622500 Pi2 = 2.127500 (Nux) = 9.972295 Pi2 = 10.448757 Sigma = 1.458595 x .04 = .058544 rags. p t ? - .67449 x .058544 - .059552 ^4u 6.524555 = .006222 Sigma = 5.252450 x .04 = .129298 mgs. P.E., = .67449 x .129298 _ .087210 ` siS * 6.164414 6.164414 = + .014147 mean = 2.150000 x .04 + .02 mean = 3.157894 x .04 + .02 = .106000 mgs./gm. ash p-E-a = dHt = -008799 = .146316 mgs./gm. ash p-E- = riHt - 20007 mean = .106 .009 mgs./gm. ash 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.l.dif. = J(.009)2 + (.020)2 = 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 - .022 KJr 0019100 filling Station Ethyl 1927 - 1929 Pb in faeces mgs Pb in Faeces (Total) 1927 (excluding case no. 4) f X fx fx2 Pb in faeces mgs. 1929 fX .0 - .079 1 0 .08 - .159 6 1 .16 - .239 2 2 .24 - .319 5 3 - .32 - .399 2 4 .40 - .479 1 5 .48 - .559 0 6 .56 - .639 2 7 .64 - .719 1 8 ' .72 - .799 0 9 80 .879 0 10 .88 - .959 0 11 .96 -1 .0# 0 12 1.C4 - 1 15 19 Uu = 67 _ 3.526516 1 19 0 6 4 9 8 5 0 14 8 0 0 0 0 13 67 0 6 8 27' 52 25 0 98 64 0 0 0 0 169 429 .0 - .079 .08 - .159 .16 - .239 .24 - .319 .32 - .599 .40 - .479 .48 - .559 .56 - 3 .3 8 0 3 1 1 1 20 0 1 2 3 4 5 6 7 Hux _ 49 _ 2.450000 20 fx 0 3 16 0 12 5 6 7 49 fx2 0 3 32 0 48 25 56 49 193 Nu 2 = Mi = 22.578947 2 19 (Jnij.)2 = 12.454905 Kuo = 9.650000 20 (Nux) 2 _ 6.002500 Pi2 = 10.144042 Sigma = 5.184971 x .08 = .254798 mgs. Pb P.E .'sig. .67449 x .254798 if[i5c8a* .171859 6.164414 = + .027879 Pi2 5.647500 Sigma = 1.909842 x .08 = .152787 mgs. Pb P.E. sig. _ .67449 x .152787 fiST _ .105055 6.524555 = + .016294 mean = 5.526516 x .08 + .04 = .522105 mgs. Pb t v -p _ .171859 _ .171859 _ . m " fjT " 4.358898 " 'ZM27 mean 2.45 x .08 + .04 .1960 + .04 .236000 mgs. Pb .103053 _ .103053 _ . p*E*m _ J-' - 4.47SOS5 " * 0S3045 mean = .522 .039 mean = .236 .023 S.D. = .255 + .028 mgs. Pb S.D. = .153 + .016 Test of Difference mean 1927 = .322 mean 1929 = .256 Diff. = .086 Diff. = .086 y 4 P,E*dif. *026 p-E-dif. = yToSS)2 + (.025)5 = f.001521 + .000529 = jC000681 =- .026096 He Although there is a decrease in total lead for 1929 as compared to 1927, the difference is not statistically significant. 0019101