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Retired NBME 23 Answers

nbme23/Block 4/Question#16 (reveal difficulty score)
In a study of the use of ultrasonography for ...
80% ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—yb_26(315)
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oalmnrba tets ultsre msean atth ttes esttedc ceacrn t;=&g

  • 35 fo 50 men hwti sertopat cenrca evah ambnlroa tset tesrlu gt&;= n fo tps ihwt rcecna = 0.5 estT hssow cacrne in 53 emn ;&=tg 5T3=P &tg=; we nac leacculat NF = 3505- = 51

  • 02 of 010 emn totiuhw teopatsr cencar eahv alobrnma tets luersst &g;=t FP 2=0 &=;tg we anc cueaatcll NT = 200-108=0

  • nwo ew acn utelccala iiceysitcpf = +FNT(N/PT) = 100/08 = 80. (in % ilwl eb 8%0)

reeh is my /44 lt:bea [mmrnc3etisewe/atromb/imqwrc/sttbpet/om._3mtdlponuis2o/lssne1_ute_.dt/:h/wo/sccwuf]

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smc213  caxElty ahwt I d!di +
smc213  I loegdgo eth ngeimna fo mroanabl tets rseluts sujt ot eakm su.re A iepiotsv etts si eon in wcihh eth lurets fo eth estt is omaln;rab a etgevani etst si neo in ichhw the s'test eltsur si nroma.l +4

This guy on youtube does a killer job on explaining all these problems. Just does problem after problem on 2x2 tables and a few other topics. The link to part 1 is added, part two you can find on the side panel I'm sure. Part 1

+1/- paulkarr(73)


 +1  upvote downvote
submitted by โˆ—meningitis(643)
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heT itnuqoes is scufngion sbcueea a REUT IEOVISPT tets rsluet si idnnifg gntedceit aencrc by US og(es to wsoh uyo we gtoat lkoo ta awht eht stet si linkoog .r)of

An MLRANBAO tset iecdgttne CrPa ensma sit TON A ITSVPEIO: ie: 53 uto fo 50 reew slFae iissPevot

nA ALORANBM sett TTIUWHO rPCa easmn ist NOT A GIEA:VNET 02 uto fo 010 OUIHWTT rCaP wree AELSF VEA.GETNI

TN = ,80 FP = :p.i1fiSyt c5cei (PF;T/+)NNT )08/+(0815 = dA%84.n icnse it asys steb" tsnrpeeser" thne 48% si esosctl ot 08.%

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 +0  upvote downvote
submitted by โˆ—lfsuarez(160)
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20 of teh 100 nem uhttwoi reptosta ecarcn eavh aaombrnl etts u.rstels

itiyfScpeic = P+FTF/PN = 10002/ = 0.8 = 8%0

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seagull  a.sotml 0/0 112 0 = 38% glohury 8%0 +
amirmullick3  oNt urse whta rszlufae nad sueallg vaobe nea.m Here si my c.ioefiaet nlcniSxtaippy = .+NTF(P)T/N ishT etst vgea 20 alfes sopvieits uto fo 010 oe,lpep dan lyon 51 true agnteveis otu of 50 cy.iinieSpm ectf saol sueqla ,rae-tF1P and erhe teh FP etra sseme 2%0 os =80%1.20%%-00 +4
yb_26  onabrmla ttse rusetl nasem pt sha eacrnc T gtP;=& = 5,3 FN = 51 5,-0()53 0PF2=, NT 0=8 000(12-) g&=t; esicypctiif = (FP+N/TT)N = 8/0001 = 0.8 n(i % lwli eb %8 reut)0 aveeitngs ear 08 tuo of 1,00 tno 15 tuo fo 05 +2
bulgaine  If uyo lcperae teh sleavu orfm teh siqueton ni teh eblat fo epga 752 of AF 1,092 b6y_2 oxitalaenpn is .ceroctr nlAbamor ttes = tetpnia hsa ecnrac = sett is+nQo etu ysas 50/53 men wthi raosettp narecc os( lla 05 aehv cn)rcea noly 53 aehv ralbnoma tset ssler,ut angeimn ttha 3P=T5 esed(sia + stet )+ nad F=N 15 sdeaeis( + etts - escueba htey od evah eanccr ubt hte test aws not abonalrm rfo hmte .) 010/ 02 mne tuhwiot rptetaso rneacc vhae molaabnr tset teurssl agnneim lal 010 NDTO veha ccaenr btu 02 wosh taht ethy ahev ccenra hnwe sti nto erut os =P0F2 eidsesa( - ttes )+ dan TN 80= idaee(ss - tets -) +



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