"'IpothtSlS 1ts+ en p.-ShlQll Sampl ) (J ol'\knOOJn ,

DQtQ Fro NO(i'1\Ql Po~oIQ+'0"[X", AcJlomol>,f.t a:tMvst C6IIfollU Qt1

()Vtff).~'-of fj() po~ per oul('01t (ppm)oJ t'Qrbon mCh.oXlde , f1 neW poflo+/oncordrol dfVltt. r s pfQ(~d D~ fin fOnd"", ~seluitd roiS, H:,' -Hltst 10 cars, nUl4n

carbon Mfmoxfde tm,SS/on WQS ':/5ppM .WI#! Q sfarrlard Je'l,Qf,on of zo ppm.Dots #Ie fleWpollvtlon CD"fr, / ~ v Icesl~nrflC(Jn+ly reduce carbon mo"oxuJetrnlsslon? USt tJ.: 0.05. YfN tnlUj

QSSUM HIt t»+a (Omts from Q

NDfmo.( j)'st,

I) "(): .«:qoz) Hit: Ml. 903) rA.: 0.05

q) ltr.~-~tQ+,~hc.T=- X - JJo

. -. .•(5/(;\)~5- qOt2°1i1Q)

-IS.. ~-- -(g.12l\b

= --2,31s) P-'1aIUf 0{ +~t staflsflc.

SlY\«~ R A : JJ.. <. Cio • Wt mvs~ flY'ld#1e. probalu J .f '1 o.f ,e.tf,"3 Q.

'lolue ot - 2.31 or ~mQllfr

Itf-mu-S:roall-2

Hi- /.l-S.~QlI'3

+0"( +ftt tes+-f)tahstft) ,e.)PtT~ -1.'3-=l)

U~lnCj 0. t -d\~+ wlth df= n-I ::q.Nott at, IYl th IS l~Qmple) W(

can"o\- lJSQ a staV\etard nofOl2I<1\«::.\. +0 find *"s ?YobQbl'd~-5\Y\le n IS NOT 141 e.

*"

lOO'll~ '''' fh(!. t ~,list \ +o~Ie. R3alo'f\~ trow +OY" q dlf. J we.t..~-\-t> .fInd - '2,'3'1 J hut nof,ce #totan \lQlu5 \Yl fhQ t-t4blr an positIVe.

&,\ we. CQY\ o!. ~~'M m~tr'l~~ i...!f,stto h"l~ us. Mote fhe.-1 2,3~ IS

btt-we.f. 2.2(,1, (Un4Cl th~ (0 10m•..•

jQheled O.Ol~}afld ~,iZ.' (ondf/T-U

-)Ol4IH

*" CO\OM1\ labelul ().Q I)SO 00" p-\fa(oe. IS soMcuohetebe,twet\1 0.025 Qnd 0,0 I

(,~btt\slfJn

llfl1tc.t "0 If p-value. f l/..

\JJf.. know fhG+ oor p ...volot. IS

p-\lotoe L.. 0.025 , and s,nc.e0.025 <. 0.05 (O<Jr o£.)} +~eY"l

p-volue ~ 0.05.

SO W~ ( t.JtC.T Ho.':1) A~ the 5 9u 51~m.ft(QnOl 1t~"eJ,

thfl e",dtflte \mlCQtfs fhQt the.new pollutloY\ ctmtrClI dflV(Ce,

HT-u,-Srr"QII- 5

does s~rnt\(QYlH'I fedoce. a"ef(l~eCArbon rnono~,4IeM~~\ICw- Itvcl,

Note ~ M o~t stah~ (to. 1 COM putf rSo{~WQ(t P'fod.u.tfS e~Q(.+p-'1Q\oes.

Assuntpho'lfs - RamJ~ sQnrjJk ofIndepetlrJetf.r f9bser-I/IA/"ns from

« N(JYfM,( /)/S+.