2. interpreting linear functions

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1、PartIIInterpretinglinearfunctions1.Theexpression1.08s+1.02bpredicttheendofyearvalueofafinancialportfoliowheresisthevalueofstocksandbisthevalueofbondsintheportfolioatthebeginningoftheyear.Whatisthepredictedend-of-yearvalueofaportfoliothatbeginstheyearwith$200inthestocksand$100inbonds?$Corre

2、ctanswer:318Difficultylevel:1Tag:Datacollectionandconclusions2.Thegraphaboveshowstheresultsofacontrolledexperimentdesignedbyascientisttodeterminetheeffectofmagneticfieldstrengthonthegrowthofsunflowerplants.500youngsunflowerplantswererandomlyassignedtothecontrolorexperimentalgroup.Inthecont

3、rolgroup,thescientistgrew250sunflowerplantsundernormallocalgeo-magneticfieldconditions(30microteslas).Intheexperimentalgroup,thescientistgrew250sunflowerplantsidenticallyexceptunderalowergeomagneticfield(20microteslas).Basedontheresultsofthisexperiment,whichconclusionisNOTvalid?A.Sunflower

4、plantsgrownunderlowermagneticfieldconditionsweremorelikelytoweighmorethansunflowerplantsgrownundernormalmagneticfieldconditions.B.Thereisevidenceofanassociationbetweenthestrengthofmagneticfieldandheightinsunflowerplants.C.Sunflowerplantsgrownunderlowermagneticfieldconditionsweremorelikelyt

5、obetallerthansunflowerplantsgrownundernormalmagneticfieldconditions.D.Membersofthecontrolgroupweremorelikelytogrowtolessthan100inchesthanmembersoftheexperimentalgroup.Correctanswer:ADifficultylevel:2Tag:Datacollectionandconclusions1.AresearcherwantstoconductasurveytogaugeUnitedStates(U.S.)

6、voters’opinionsabouttheU.S.Congress.WhichofthefollowingshouldNOTbeacomponentofthissurvey?A.Theresearchercollectsdatafromthesurveytakers.B.Theresearcheranalyzeddatafromthesurveytakers.C.Theresearcherdistributesthesurveyto10,1000randomlyselectedU.S.citizensaged18andolder.D.Theresearcherdistr

7、ibutesthesurveyto10,000residentsofaWashingtonD.C.neighborhood.Correctanswer:DDifficultylevel:2Tag:Datacollectionandconclusions2.Ascientistwantstocollectdataabouttheeffectsofgravityonthegrowthofsoybeanplants.Totestherhypothesisthatsoybeansgrowbetterinazero-grav