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Retired NBME 21 Answers

nbme21/Block 4/Question#11 (reveal difficulty score)
A study is conducted on patients with asthma ...
If the treatment really changes the mean asthma score by 0.4, there is an 80% chance that a study of this size will find a p-value < 0.05 ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
tags: biostats

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 +10  upvote downvote
submitted by โˆ—imgdoc(183)
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saBlcayil sith tesoquin tjsu saks htaw" si wo"erp dna sask oyu to nleiaxp that 0%8 erw.op rewoP is 1 - teab (yetp 2 orerr,) lalbsayic whne a reefdcinfe istsxe nda teh null eihstpohsy is djcetere si pwor.e So if eht Rx tdctese a emna dffencreei of .40 ni asmath in eht netiptsa in eth temenrtta og,urp then htta atda flsal ni eth 08% rpweo ,range nda its ifcnngsiacie is 59% &,0l)p5(t0.; P eulva is ustj hte bplibtaoriy fo hgneomsit pnhiagnep yb ,caench os uyo htwa ihts ot be lsse taht 5% os eewhrtav you svoberde sint' ih.lstulb

I heop iths ep,held nda cctoerr me if 'mI gonrw.

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yssya1992  I evah a tsueionq : thwas hte laeroint nhte tnebeew orewp dan P lvuea ? +
privatejoker  Tihs one okot em a uitnme and wsa nudrgi eth lats block os my arnbi asw dyeraal edr.fi uBt my goenarsin aws ,ahtt as esdtat eo,abv icsen it evga ouy wpreo, it si yliaclabs ustj a dwe-gnnildo ayw of inagks tahw orPew s,i dan woh tshi serteal to lev-.aup P-uavle si eht odsd atht hte ifdngni wsa eud to acchne o.enla svyliouOb a e-lapvu tes to 0;5t0.&l simliep a rteager athn 9%5 caenhc thta het dgiifnn is ti.egl Scein eht wrope is said ot be 0,8% ihst senam hatt teehr is na 8%0 nhecca ttha hte usdty iindngf is tlgie, ta aestl oicnuhsm atht it met eht t-psree iacrrite of eignb 9%5 -choennnac dt.eelar +
sahusema  8%0 achcne pewr()o het ytdus rltcyerco sdifieeitn hte nisxceete fo na stooicaasin ni elta.iry If na ioacnitsosa is needtmeidr ot txi,es 5&%;t9g ecncah eht ydsut nad ailrtey argee whti hace oreth ;tlp(5)0.& +1



 +8  upvote downvote
submitted by โˆ—andro(269)
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A TNEO OT EMISLP NDMDEI SEUTNSTD KIEL FSELYM :!

irFts tepS : ewrPo si apyltriiobb ro ccaneh ( tath a tsyud lwil eetdct a eurt rcidfenfee) . oS ceacln uot eyrev ilnegs ntoopi atth syas 08 % of ussbetjc ( ndA I enma yrvee lignse oen of temh !)! hicwh is lybsacila rvyee englis ionpot from A ot D

donSec Stpe : hsit lsaeev yuo whti nyol toionp E and F ciwhh ear own ntunqsegoii uory ddnisenrgtnau fo hte p uvael ( gniaa a rtilpyibaob ean/chc tsath a dtusy lwil dettec a ieceffrnde newh nneo sxtsie )n I uro dsytu all hte lavues tobedani rwee itaessdoca itwh a p lueav of 503.0 .ei slse hnta 005..
PN T(OIO F )

dhirT petS : Pcki otipno F

uYo iwll dfni atht tosm fo eehst qstesinuo ear stuj a ylap no drswo - 80 % pbbliitaroy sv 08 % of ctebjsus to ttse whetehr you renudndats thwa het etmr lylrae mnsae

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 +3  upvote downvote
submitted by โˆ—nosancuck(102)
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lcBka howaP!

Powha = 1 - TBEA = ad trae fo med UETR TSVPO;SIIE uwz ad eatr ta whihc uyo tge ad rute vepstiiso srsoac a achnub uds?tsie %80 eher rbhu

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lostweightthxnorovirus  evweerhr ouy deenrla itsbosat I anwna laner ;) +12
djinn  vtsniiiStey si teh trea fo utre tissovipe. eBat si the aret of eafls aignse.vet +
helsinki  ... yeah oryeu' ilyentidfe a iehtw amn +2



 +1  upvote downvote
submitted by โˆ—brasel(20)
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oewPr = biayitl ot etcdet a dffeinerce eebenwt posrug fi( eon t esxP)is vaeul .(00l5t)&; = raiiybbpotl that eurslts erew deu ot nmdora acchen

%80 wproe = %08 cchean of het dtsuy ignbe able ot teedtc ymmpsto gcash,en wchih in tshi easc was A(K.0A 4 08% ccenha of nictteedg a ganiinctisf p aeuvl)

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 +1  upvote downvote
submitted by โˆ—sahusema(173)
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0%8 echnac p()ewro eht tdsyu lycecrotr nisfieidte eth etecsenxi fo na soaancisoti ni yrateil. fI na asnsotiioac si tmdeeiedrn ot tixes, %t&g;59 nhceca hte dtusy adn reilyta rgaee twih heac hreto 0&t)(l;5p.

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