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Geochernical Cmisultin Services. LLC
<br />Saluklh Speom5m and RmomwKS MoMig
<br />Groundwatc-, and Soil G'cocheuusf.it
<br />E, i i r j rn i i i ii c i i ia I A n i :: i j
<br />The probability statistic. f , ed by the Shapiro-Will, TC,5t determilles wfiethQr (lie data
<br />1515" a 1wnutl the staied confidence, $$itemM. Or a swed cotIcluv-
<br />Wel of 95 pet went, p inn W preater ths 0,05 it) aocc'pt flit 111,111 hvpodlesis Ohm the
<br />followa norm;d did !fill„t dxa do not fblo-t� a normal distribu iwn, the data may
<br />be log nransTrined (ulng thenalm logarithim) and $.. run to deit'-
<br />watwRanwd dma aalov, a lognorrnial distriki6on, ifneithel the' original data nor iog-
<br />data pass the Shapiw %VHk Test (Le, p less than 0,0 en 5), ch it rnus be
<br />concl Ow At data do no; Ulov, a normai or log dist-bution %, hen he data
<br />do not lbHow i noinial or lot- distribwion, the nlean and .; Landcard dle are
<br />11i because these paranic�.crs are dknck CONLY Ior a ni or io
<br />P. lhat do not f'ollo%v a nornial i")I lo, generally t
<br />sets that hive a izrge numi7er ol', al or nc�ar the �ieteciion limit or s onic ri��suhs hosl
<br />.17.
<br />Very high Nalues 0 e , an myrnmetriai dWriNnion). I'his type ol'olaua stiz is a
<br />da"a so, and K sanfe distribution nhtst be anaNzed Wh ncnpatmnw&c teAniques
<br />(Giben, 19A Madwaky, 198S) io cleHne the inedian, ClUantile.s. and inter-qtiantile rano' e
<br />(IQR). provided the rem& at the de[ec6on Arnh do not exceed 7 percent
<br />Or TO W QnEs The imismgmal data sets ,ire o ered, ftoln to highest
<br />and be nwTan in the wink valw in the ordemd aria a set, vvhfle t lie 0.25, C15 and 0,75
<br />quan,iies are 01;, Values suOi hat 29%, 50% and WN, cfall Vilill,",S JbIl belOW018a VaILK",
<br />'Me : IOR is he i�eiwccn the 175 and 025 (lLIaJItiICS �lCdian aVd IQR, "Irt�
<br />better indfic4t, ",Fs in a nownomut asymmuric chstdinnin t Yecause
<br />thwe stahAcd quanlitie�arc iuflu� less, relative to the nnQan and standard dcviation,
<br />by very large or verysmali vaiues,
<br />Plo rtech should dcscritQ 0 valid mmitiad mcdoc[s hat oil be used to dcvdop the
<br />baschne values it', &ccordanc�� with accepled g dancc.
<br />ReArcuces
<br />We Ran Sodo Ar Me Tuming of NbtW6 I ASTNI), 1998, Shmke
<br />stolistict'l/
<br />11w1wons, D63 12, %Va,shin DC
<br />Oilbe,rt, K,0- I 9S7 Van
<br />No Reinhold, N��w Y;- Ne%v Vor�
<br />Madansk, A, 1988, ff,� Sle tits. Springer-Wiag, No%
<br />York, York
<br />376 Fallcwrec imi
<br />Blue P"h. OH 45 2%
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