graphs_ppt.ppt

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1、GraphsVisualrepresentationsofdataComponentsofanexperimentPROBLEM:Astudentisconductinganexperimenttotesttheeffectsofartificiallightongeraniums(plants).Thestudentwantstomeasurethegrowthrateoftheplantexposedtoartificiallight.Control--wemusthavesomethingtocompareourresultstoso

2、thatweareabletoanalyzethedataappropriately.Acontrolisacomparisongroup.Forinstance,intheexperimentdescribedabove,thecontrolwouldbeaplantexposedtonormallight.ComponentsofanexperimentConstants–partsoftheexperimentthatarekepttheSAMEthroughouttheprocess.Forexample,theplanttypes

3、usedforboththecontrolgroupandtheexperimentalgroup,thesizeofthoseplants,theheightofthoseplants,theamountofwatergiventotheplants,etc.Constantsallowustoensurethatvariables(inthiscase,lightisthevariable)arenotinfluencedbyanyotherfactors.Variable(s)–whatweareapplyingtotheexperi

4、menttomeasure.Forexample,light,inthisexperiment,isthevariable.WemustbesurethatonlyONEvariableisbeingtestedeachtimeweperformanexperiment.Whygraph?Afterconductinganexperiment,agraphcanbeusedtovisuallyrepresentdata.Graphsallowaquickviewofthedatatrends,ifthoseexistDatatrendsar

5、epatternsthatcanbeseeninthedataDatatrendscanbeusedtopredictwhatmayhappeniftheexperimentweretocontinueDatatrendscanalsobeusedtoexplainthedataanddrawaccurateconclusionsSettingupalinegraph…..YAxis(Thisisforyourdependentvariable)Settingupalinegraph…..XAxis(Thisisforyourindepen

6、dentvariable)ExtrapolationExtrapolate:extendingthegraph,alongthesameslope,aboveorbelowmeasureddata.Prefixextra-meansbeyondInterpolationInterpolate:predictingdatabetweentwomeasuredpointsonthegraph.Prefixinter-meansbetweenWhatelsemustagraphhave?T-TitleTeachers’FavoriteSinger

7、sWhatelsemustagraphhave?T-TitleA-AxisTeachers’FavoriteSingersYAxis=DependentVariableXAxis=IndependentVariableWhatelsemustagraphhave?T-TitleA–AxisS–ScaleTeachers’FavoriteSingersDecideonanappropriatescaleforeachaxis.Chooseascalethatletsyoumakethegraphaslargeaspossibleforyour

8、paperanddataHowtodeterminescaleScaleisdeterminedbyyourhighest&lowestnumber.Inthiscaseyour