Document Lgg2wKMEZ9QNZaQXM9wjjeV2d

Tank |1agon Ethyl - Comparison Tank Wagon Ethyl 1927 - 1929 Lead in Urine rags./Liter 1927 1929 I.igs. Pb per (exclusive of case No. 104) Mgs. Pb per liter urine f X fx fx liter urine f X fx fx .0 - .039 .04 - .079 .08 - .119 .12 - .159 .16 - .199 .20 - .239 4 - .279 .28 - .319 .32 - .359 .56 -- .399 .40 - .439 .44 - .479 .48 - . M s .52 - 10 0 51 32 15 04 05 06 17 18 19 0 10 0 11 1 12 23 00 55 6 12 59 00 00 00 7 49 8 64 9 81 00 00 12 144 50 364 .0 - .039 .04 - .079 .08 - .119 .12 - .159 .16 - .199 .20 - .239 .24 - .279 .28 - .319 .32 - .359 .36 - .399 .40 - .439 .44 - .479 .48 - .519 .52 - 60 11 1 22 13 14 05 16 07 18 09 0 10 0 11 0 12 1 13 24 00 11 11 48 39 4 16 00 6 36 00 8 64 0Q 00 00 00 13 169 49 315 Nux = 12. = 2.173913 23 Nu2 15.826087 Nu, = ^ . = 2.041656 1 24 515 Nu 2 = 13.041656 24 (Nux)2 = 4.725898 (Nux)2 = 4.168400 Pi2 =11.100189 Pi2 = 8.873266 Sigma = 3.331694 x .04 = .133268 mgs. P E - = .67449 x .155268 _ .089888 * `Slg* 6.782329 6.782329 Sigma = 2.978803 x .04 = .119152 rags P E - .67449 x .119152 _ .080567 * * sig. 6.928203 6.928203 = .013253 ' = .011599 mean = 2.173913 x .04 + .06 mean = 2.041616 x .04 + .02 = .146957 mgs P.E.ja .089888 = .018743 4.795831 P.E.m 101667 mgs. .080567 _ + .016405 4.898980 " mean = .147 .019 mgs./liter mean = .102 .016 mgs.f\i.ter S.D. = .133 .013 S.D. = .119 .012 mgs. mean 1927 = .147 mean 1929 = .102 Diff. = .045 Test of Difference Diff. = .045 = 1 + .025 P*E -dif. = (-019)2 + (-016)2 = J.000361 + .000256 = 4.000617 The difference is in favor of 1929 but is not significant. Note exclusion of case No. 104. Tank Wagon Ethyl 1327 - 1929 Lead in Urine (Total) 1927 '. 1929 Pb in urine (exclusive of No. 104) Pb in urine mgs. f X fx fx2 mgs. f X fx fx2 .0 - .059 .04 - .079 .08 - .119 .12 - .159 .16 - .193 .20 - .239 .24 - .279 .28 - .319 .32 - .359 .36 - .399 .40 - .439 .44 - .479 .48 - .519 .52 - 10 51 6'2 45 44 15 16 17 08 09 0 10 0 11 0 12 2 13 23 00 33 12 24 12 36 16 64 5 25 6 36 7 49 00 00 00 00 o- 0 26 338 87 575 .0 - .039 3 0 0 0 .04 - .079 6 1 6 6 .08 - .119 9 2 18 36 .12 - .159 4 3 12 36 .16 - .199 14 4 16 .20 - .239 0 5 0 0 .24 - .279 06 0 0 .28 - 17 7 49 24 47 143 Nux = ^ - = 3.782609 23 Nux = = 1.958334 24 Nu 2 = ^:5- = 25.000000 25 Nu 2 = 145 ~ 5.958333 24 (NUi)2 = 14.308131 (NuX)Z = 3.835072 Pis = 10.691869 Sigma = 5.269842 x .04 = .150794 mgs P.E.sig .67449 x .150794 6.732529 Pis = 2.123261 Sigma = 1.457141 x .04 = .058286 mgs. Pb P.E.sig .67449 _x .058286 _ .059515 ~ 6.928203 = .013007 = .005674 mean = 3.782609 x .04 + .02 mean = 1.958534 x .04 + .02 = .171304 mgs. Pb P.E. ra .088219 = .018395 4.795851 098333 mgs. Pb P.E m ~ 059515 _ .059515 4.898980 _+ " .008025 mean = .171 .018 mgs. Pb mean = .098 .008 mgs. Pb S.D. = .131 .015 rags. S.D. -- .058 .006 mgs. Test of Difference mean 1927 = .171 mean 1929 = .098 Diff. = .073 I*----- ------ Bmajgm P.E.dif. = 4(*018) + (.008)2 = 4.000324 + .000064 = 4.000388 = + . 020 - M i . = sSSS. = 5.65 + P.Edd^^ .020 The difference is in favor of 1929 but is not significant. Note exclusion of case No. 104 - 5.00 mgs. in sample. Tank-Wagon Ethyl 1927 - JS29 Lead in Faeces mgs./ga. Ash Mgs. Pb per gnu ash 1927 f X fx fx2 Mgs. Pb per 1929 gnu ash f X fx fx2 . .0 -- .039 1 0 0 o .04 - .079 4 1 4 4 .08 - .119 5 2 10 20 .12 - .159 4 3 12 36 .16 - 3 4 12 48 17 38 108 No information 7, in 1927 and 1929 .0 - .039 .04 - .079 .08 - .119 .12 - .159 .16 - .199 .20 - .239 .24 - .279 .28 - .319 .32 - .359 .36 - .399 .40 - .459 .44 - .479 .48 - .519 .52 - 70 21 32 23 14 15 06 07 08 09 0 10 on 1 12 17 00 22 6 12 6 18 4 i 5 25 00 00 00 00 00 o0 12 144 35 21? to H il ii = 2.235294 17 Nuj_ = S i = 2.058824 17 = 6.352941 17 Nu2 = = 12.764705 17 (Hui f = 4.996539 (Nili)2 = 4.238756 > Pi2 = 1.356402 Sigma = 1.164647 x .04 = .046586 mgs. P.E.sig. = .67449 x .046586 _ .031422 4~34~ 5.830951 = .005589 , W s = 8.525949 Sigma = 2.919923 x .04 = .116797 mgs P.E.sig. = .67449 x .116797 _ .078778 5.850951 5 .830951 = .015510 mean -- 2.235294 x .04 + .02 mean = 2.058824 x .04 + .06 = .109412 mgs. Pb P.E.a = = .007621 4.123105 = .142355 mgs. Pb .078778 _ + 019106 P*Em = 4.123105 " mean = .109 .008 mgs. Pb S.D. = .047 .005 mgs. mean = .142 .019 mgs . Pb S.D. = .117 + .014 mgs Test of Difference mean 1929 = .142 mean 1927 = .109 Diff. = .033 Diff. _ .055 _ 1 , P.E.dif. .021 p -E -aie. = J (.o o 8 )2 + (.019)2 = 4.000064 + .000361 = 4.000425 = .021 The difference is again in favor of 1227 but is not significant. Tank Wagon Ethyl 1327 ^ 1929 Fb in Faeces (Total) 1927 1929 Pb in faeces Pb in faeces Ings. f X fx fx2 mgs. f X fx fx' 0 - .079 08 rXSS: 3 0 0 0 16 ~ .233 4 1 4 4 24 - .319 3 2 6 12 52 - .399 2 3 6 18 40 - .479 3 4 12 48 48 - .559 0 5 0 0 56 -- 2 6 12 72 17 40 154 ,, 40 -= 2.352941 Nul - 17 2 17 = 9.058824 .0 - .079 .08 - .159 2 0 .16 -- .239 2 1 .24 - .519 3 2 .52 - .599 3 5 .40 - .479 1 4 .48 - .559 3 5 .56 - .659 1 6 .64 - *713 1 7 .72 - .799 0 8 .80 - .879 0 9 .88 - .359 0 10 .96 -1.039 0 11 1.04 - 1 12 17 0 2 6 9 4 15 6 7 0 0 0 0 12 61 Nux = .589235 17 5 N II 361 _ 21.235294 17 0 2 12 27 16 75 36 49 0 0 0 0 144 361 (Nuj.) = 5.556551 (NUl) = 12.882608 Pi2 = 5.522495 Pi2 = 8.352686 Sigma 1.876851 x .08 = .150146 mgs. P-E-sig. .67449 x .150146 _ .101272 5.850951 5.830951 = .017368 Sigma = 2.890101 x .08 = .251208 mgs. P.E.sig-. = *67449 x .231208 5.850951 = .155947 5.850951 = .026745 mean = 2.352941 x .08 + .12 mean = 5.589255 x .08 + .12 = .308235 mgs. Pb P.E.ra = -- vL.Q172 = + .024562 4.123105 = .407139 mgs. Pb P.E.m = _*_155974 = .057829 4.123105 mean = .508 + .025 mgs. Pb mean = .407 + .038 rags. Pb S.D. = .150 .017 mgs. S.D. -- .251 .027 mgs. Test of Difference mean 1929 = .407 mean 1927 = .508 Diff. = .099 p *E*dif. =J (*025)2 + (.038)2 = 4.000625 + .001444 = 4.002069 = .045 Diff. = .099 = z + P.E.^^j* .045 In this case the difference is in favor of 1927, caused by one high finding in 1929. This finding seems reasonable and cannot be excluded. The difference is not at all significant.