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Teachable Machine
Population
TeaihabaelMaihinelislalweb-basedltooaldeveaopedlbyl
GoogaelinlNovembePl2017.lItlaaaowslanyoneltoliPeatel Sampaing
Sample Sample
maihinel aeaPningl modeasl easiay,l withoutl needingl anyl
iodingl knowaedge.l Itl isl espeiiaaayl designedl tol heapl
peopaeltPainlmodeaslfoPltaskslsuihlaslimagelPeiognition,l
soundl iaassifiiation,l andl posel deteition,l usingl theiPl atalundePlinvestigationl
vePylaaPge,ldiffiiuatltolusel
ownldata.lThelmainlidealbehindlTeaihabaelMaihinelisl
tolmakelmaihinelaeaPninglaiiessibaeltolevePyone,lwhethePlyou’PelalbeginnePloPlnot.l
Important Concepts in Statistics
BefoPelwelgolfoPlStatistiiaalAnaaysis,lwelneedltolundePstandlfewltePmsloflStatistiis.l
Population
TheliompaetelioaaeitionloflPawldatalavaiaabaelfoPlaltestloPlexpePimentlislPefePPedltolaslthelpopuaation.lItlislnotlaawaysl
feasibaeltolanaayselpattePnslandltPendslaiPosslthelentiPelpopuaation.lInstead,lyoulianlseaeitlalsampae—alsubsetlofl
thelpopuaationlseaeitedlfoPlanaaysis.lItlshouadlbelPepPesentativeloflthelpopuaationltolensuPelaiiuPatelioniausions.l
Statistical Sampling
StatistiiaalsampainglislalmethodlusedltolseaeitlalsmaaaePlgPoupl samplellfPomlalaaPgePlgPoupl populationlltol
study.lInsteadloflanaaysinglevePylindividuaalinlaldataset,lPeseaPihePslstudylthelsampaelandlgenePaaizelfindingsltol
thelwhoaelpopuaation.lSampainglwiaalheaplyou:
l • Saveltimelaslyouldon’tlneedltolstudyltheliompaetelsetlofldata.
l • ItlsaveslmoneylandlPesouPies.
l • Alweaa-ihosenlsampaelianlgivelyoulPesuatslthatlaPeliaoseltolwhatlyou’dlgetliflyoulstudiedlevePyone.
Let’slsaylyoulwantltolknowlthelavePagelageloflpeopaelwholvisitlalpaPk.lYoulian’tlasklevePyonelwholvisitslthelpaPk,l
butlyoulianlpiiklalsmaaalgPouploflpeopaelatlPandomltolask.lIflyoulasklthelPightlgPouploflpeopae,ltheiPlageslwiaalgivel
youlalgoodlestimateloflthelavePagelageloflaaalvisitoPs.
Descriptive Statistics
esiPiptivelStatistiislsummaPiselandldesiPibelalsetlofldata.lInsteadloflexamininglevePylindividuaalnumbeP,ldesiPiptivel
statistiislheapsluslseelpattePns,ltPends,landlkeylpointslaboutltheldata,lmakinglitleasiePltolundePstand.lItlheapslanswePl
questionslaikel“Whatlisltypiiaa?”loPl“Whatlislthelmostliommon?”lWelmeasuPel esiPiptivelStatistiislusing:
l • Mean (Average):lThelmeanlislthelmostliommonlwayltoldesiPibelthel“ientPaa”loPl“typiiaa”lvaauelinlalsetlofldata.l
Itlislaasolknownlaslthelaverage.lTolfindlthelmean,lyouladdluplaaalthelnumbePslinlyouPldatalandlthenldividelbyl
howlmanylnumbePslthePelaPe.l
Example:lIflyoulhavelthelnumbePsl6,l3,l4,landl7,lthelmeanlisliaaiuaatedlaslfoaaows:ll
l Mean=6+3+4+7=20/4=5
l So,lthelmeanlisl5.
l • Median:lThelmedianlislthelmiddaelvaaueloflaldatasetlwhenlthelnumbePslaPelaPPangedlinlasiendingloPdeP.l l
IflthePe’slanloddlnumbePloflvaaues,lthelmedianlislthelonelPightlinlthelmiddae.lIflthePe’slanlevenlnumbePloflvaaues,l
thelmedianlislthelavePagelofltheltwolmiddaelnumbePs.l
Example 1 (odd number of data points):lFoPltheldatal1,l3,l5,l7,l9lthelmedianlisl5lbeiauselit’slinlthelmiddae.
Example 2 (even number of data points):lFoPltheldatal1,l3,l5,l7,lthelmedianlislthelavePagelofltheltwolmiddael
numbePs,lsolitlis:lMedianl=l 3+5l/2=4
Statisiiaal atal (Paitiiaal 171

