38pre_20110413wed_stats_86728_p11

38pre_20110413wed_stats_86728_p11 - . i D38 f A 387.”. '...

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Unformatted text preview: . i D38 f A 387.”. ' 334.: How Do We Choose 613 Sample size fora gfidj A . 006'“ Md on? 'how (was an EXIT POLL (55 55mm M1413,“ D mus-1' lie so-Hrut c "9361 for 44 has arCIERTAIN) ME- CWOVflin flew“); :9)? example 0.04. [I] Keys: 0’3 The M5- depemd’s UPON fine 3g aF-Hne samplmg - défrl'bufiam of {fine esfimai‘e (usu. $ or 32) dependihg on {he Paramefar We are {Tying 156 “Cap-Rafi," 40 0U»?- “TX-ELF" _v-‘> . wrap-l x44 N [Qccaflx 3:: «4’5 (Mm/n) or 5”. s/Jm), dependifiéj upon {sine shtuahon (49 M [g StaJ if 1’22 shr’r 00+ w/ a. 5Peci-Ftécl ME) than fig» Ca." “Wm-k backwardg" {:0 dekrmine {Jae necessary sample siaeJ £2 [a How abom‘ an EXAMPLE“? Suppose. We are Haring {:0 cAvTuraE 49 wiflk a. 3570 c: w a, ,Yharcjm of—err’or 0.04 (one usuafl'j'goes fora. ME: 0. a) ‘ How large Imusfigl,’ be (mrmat n3 im order to meeE these (qulk‘emefim [£1 for 43: m; = 1.92 (so = 1.96 J61? (I—s9J/n) ME. 2. 1.96 LEV—‘1’:— (ME): (mafm _ " (M5)“: ([536)2 5 none):- ({,%)‘?a,§) 3 n: (136)" fi (w?) n: (31; “xi; (t~’r3)7me?' (ME? 63’) 36U‘l" CG I OK So whaJr about} our s ecifi'c ample? Sumwse we alreadg had. a. rewu'i’ o“ width“ *3 = 0:63 . @fi’wg (2923’ Thus .. (L902 1? (I " [95 ____ |.%2(o.58)(o.42) ‘- MEZ' 0'04 2 5 584.883 so 2: 585 (Dow round—OFF): Do Wat—i UP) A sample size of MESS shag we a Mg 09 “WWWWH 0'04 39°F 0» 957., I far-fine. pap- proponhon/ But mac :9 You 4014'? know a ? [El 0K) So I ward: you, -&0 FOLLOW ME through 'the ACE'EE'KA "'" Sou, claw-[7 [nave to REMEM3EB if «"- '§us{' F.on M. _ Cont-'1”; oh i [E 14 I (ask a}: £14: fro/«anon; 3: xfl—x) one ‘3) = 1—12. I» t“ = ~XZ+I I can ELDTH on the, inherval [0) ij! (E) 4 W5 ® 4’5 = A, that 430*?) 1'5 MAXIMIZED (ah: Value 4 m. [E WM: if 13“. Chm-'6 know g and ‘jou “SE $3 1/2 (1.05)) FM you wing: W V]. A5 a WW0; fad cu. wil pmbabhg afghfiym-Hmafe n. W419: OK. "at E Thus, if— m the Prcwiius examtvle { 1-5.1) w; 21} pm All 391- !mow Hud- “E ‘ms 0.58) we NouH 501% {he Emblem bx 2- Nord‘u? and m=- 15% x a.” :: 606. 26 7-: m “(Lleei Our Back 6'04; ' ' Jusu‘ round‘iz- «a ' raffier Hum, {13%de P. . I Pmyerh mm ~va I? Ahofier m e, [4-is rmqu f\ n 2: M m2 ( P- 33%) {Vii-l '5 i e, m:- éhe MEwGfii ? And We aid"? know ? .(5fifl 0.595 :>. ch. 3° i="ifi—‘ae ' «saw; n=.._z"a-$M.«26‘_= mgi=E4oQ 0.5 o. 02‘ 80. The smqfleq that you. WM Hie. ME "[50 be; Hie lager Masf He gaggle gig“ be t . _— V BM: hum In §8.l (3.3%)) we see I ME:- |.%x (sealfiar Hue 95% CI. Buf m 3.! for 957» cxfirp (seep.3¢3))|se= \li’ficx—fil/nn Now Madam know f3; WC “56 13%“; 5’ W“*”‘>“9'25 ME: [fibm/ 6:25/n 25' 240.26 ul- .—: ngxJ... =1; 7 JR 2 flf I 47? and amps Wile“. 'Hde AME 'cbwies from X ' E l [Q How Do YOU Choose a. Sample, 361.5 for Eg‘I—nimfima a, m EEG“ -—~ Far 0.95%- CI for/U“) “Se- 32 t foals (38) Where se: i. (3' "s ’5‘?” ME- (00? back uses "m" {6“ “MP-3') avid £0.“ *5. (F? £602; 5- Jr? and We. (av) subshhoh the E-sm a )Q,,- at, {s-score to.“ and, (b) We “guess” cd' subs. i'l' ferns? MR: 2262: 61;“ 5 1150.25 J'n" WI: or“ m: I 'l. I whd"? :s f m:- jig-:- (r? 0"!“ 5’. = ‘3 m1”: 3 n: ma. _ .93. z or n- m I Whofi «‘g the “\5-‘5"12u\e does Nor wok? (p.393) If you. clan”: ham 4+ MM \‘5 auccesses qmd 15 gailunes, add _2__ h each cakegorg , (see p.393) 3%"? Bad. ...
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38pre_20110413wed_stats_86728_p11 - . i D38 f A 387.”. '...

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