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已知变量x,y的取值如表: 由散点图分析可知y与x线性相关,且求得回归直线的方程为,据此可预测:当x=8时,y的值约为( )
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高一下学期数学《》真题及答案
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已知xy的取值如下表所示从散点图分析y与x线性相关且则m的值为
6.4
6.5
6.7
6.8
已知实数xy取值如下表从所得的散点图分析可知y与x线性相关且=0.95x+a则a的值是
1.30
1.45
1.65
1.80
已知xy的取值如表所示若从散点图分析y与x线性相关且=0.95x+则的值等于
2.6
6.3
2
4.5
已知 x y 的取值如下表所示由散点图分析可知 y 与 x 线性相关且线性回归方程为 y = 0.
根据下面变量X与Y的散点图可以判断变量X与Y的关系是
非线性相关
不相关
因果关系
完全线性相关
对变量xy有观测数据xiyii=1210得散点图如图1对变量uv有观测数据uivii=1210得散点
变量x与y正相关,u与v正相关
变量x与y正相关,u与v负相关
变量x与y负相关,u与v正相关
变量x与y负相关,u与v负相关
对变量xy有观测数据xiyii=1210得散点图1对变量uv有观测数据uivii=1210得散点图2
变量x与y正相关,u与v正相关
变量x与y正相关,u与v负相关
变量x与y负相关,u与v正相关
变量x与y负相关,u与v负相关
已知xy的取值如下表:从所得的散点图分析可知:y与x线性相关且=0.95x+则=
1.30
1.45
1.65
1.80
已知xy的取值如下表从所得的散点图分析可知y与x线性相关且=0.95x+a则a=
1.30
1.45
1.65
1.80
已知xy取值如下表从散点图中可以看出y与x线性相关且回归方程为=0.95x+a则a=___
已知xy取值如表 从散点图可知y与x线性相关且=0.95x+a则当x=10时y的预测值为
10.8
10.95
11.15
11.3
已知 x y 的取值如下表所示由散点图分析可知 y 与 x 线性相关且线性回归方程为 y = 0.
已知xy取值如表 画散点图分析可知y与x线性相关且求得回归方程为=x+1则m=.
在对两个变量xy进行线性回归分析时有下列步骤①对所求出的回归方程作出解释②收集数据xiyii=12n
①②⑤③④
③②④⑤①
②④③①⑤
②⑤④③①
对变量xy有观测值xiyii=1210得散点图①对变量uv有观测数据uivii=1210得散点图②.
变量x与y正相关,u与v正相关
变量x与y正相关,u与v负相关
变量x与y负相关,u与v正相关
变量x与y负相关,u与v负相关
对变量xy有观测数据xiyii=1210得散点图①对变量uv有观测数据uivii=1210得散点图②
变量x与y正相关,u与v正相关
变量x与y正相关,u与v负相关
变量x与y负相关,u与v正相关
变量x与y负相关,u与v负相关
对变量xy有观测数据xiyii=01210得散点图1对变量uv有观测数据uivii=1210得散点图
变量x与y正相关,u与v正相关
变量x与y正相关,u与v负相关
变量x与y负相关,u与v正相关
变量x与y负相关,u与v负相关
已知xy的取值如下表从所得的散点图分析y与x线性相关且=0.95x+a则a=x0134y2.24.3
2.1
2.2
2.4
2.6
已知xy的取值如下表所示从散点图分析y与x线性相关且=0.8x+a则a=
0.8
1
1.2
1.5
在一元线性回归模型Y=β0+β1X+ε中ε反映的是
X和Y的线性关系对Y的影响
由自变量X的变化引起因变量Y的变化
X与Y的线性关系对X的影响
除X和Y的线性关系之外的随机因素对Y的影响
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In1traditionChineseculturetaichiisoftenrelatedtotheChineseideaofyinandyangtheideathatonecanseetwosidesineverything.Once2atimeTaoistZhangSanfengsawabirdattackingasnakeintheWudangMountainsinHubeiprovince.Thesnake'sdefenseinspiredhim3createasetof72movementswhichused4softandpowerfrominsidetodefeatviolentforce. Forthosepeople5doittaichicanbepracticedanytimeandanywherewithoutequipmentoragymnasium.Andlearningtodoit6correctgivesusapracticalwaytoachievesuchthingsasbalancemotorcontrolandrhythm节奏ofmovement.Soit7believethatpracticingtaichicaninsomewayhelpusstandwalkmoveandrunbetter. Taichi'sbenefitscertainlygobeyondphysicalones.ForMarleniCalcinafromPeruwho8dotaichiforover10yearsit'snotonlyasportbutalsoawayoflife.And9istaichithathashelpedherunderstandthevalueofgoingslowly.Nowpracticingtaichiislike10speakwithhersoul.
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Ifyouarehavingtroublefallingasleepyouarenotalone.About65%ofAmericanssaidtheyhavesleepingproblemsafewnightseachweekaccordingtoarecentstudybytheNationalSleepFoundation.Sleepingtoolittlecanleadtoahigherriskofbecomingfatandgettingdepressed沮丧的.Butbeforeyougotoadoctorforadviceitisworthexaminingyoursleepinghabitsonemoretime.Someofyourfavoriteeveninghabitsmayhavesomethingtodowiththesleepingproblems. SettingaBrightAlarmClock Thelightofyourbrightalarmclockcanpreventyoufromfallingasleep.Youcanmakeyourroomasdarkaspossible.Coverthebrightnumberswithabookorconsiderbuyingasmalltravelclock.Yourcellphonealarmmayalsodothetrick. CountingSheep Whenyoujustcan'tfallasleepit'suselesstostayinbedtocountsheep.Ifyou'vebeentryingtofallasleepformorethan30minutestheNationalSleepFoundationsuggestsyougetuptodosomereadingorwatchTVforawhile.Suchactivitieswillmakeyousleepy.Beforeyouknowityou'llbegoingbacktobedreallytired. ExercisingLateatNight Daytimeworkouts锻炼willkeepyoufullofenergyforhours.That'swhyyoudon'twanttoexercisewithinthreehoursofhittingthesack.Fierce剧烈的physicalactivityraisesyourbodytemperatureandpumpsyourenergylevel﹣botharebadforagoodnight'ssleep. 1Whatcanwelearnfromthefirstsentenceofthepassage? A.It'snotgoodtofailtofallasleepatnight. B.Peopleinagoodcompanyoftenhavesleepingproblems. C.Therearemanypeoplewhohavesleepingproblems. D.Youshouldfindsomeonetotalktoifyoucan'tfallasleep. 2Theunderlinedparthittingthesackinthelastparagraphmeans. A.goingbackhome B.goingtobed C.goingtothegym健身馆 D.fallingasleep 3Bywritingthepasagethewritermainlywantstotellus. A.whysomanypeoplecan'tsleepwellatnight B.howtoenjoyagoodnight'ssleep C.thatsleepingproblemsaretroublingmoreandmorepeople D.thatpeoplemaysolvetheirsleepingproblemsbysomehabits
如图已知点F是△ABC的重心连接BF并延长交AC于点E连接CF并延长交AB于点D过点F作FG∥BC交AC于点G.设三角形EFG四边形FBCG的面积分别为S1S2则S1S2=.
位于湖南省西北部距离湖南省会长沙约300公里占地面积9563平方千米的张家界是一座因独特的自然景色和丰富的旅游资源而闻名的旅游城市.
Mostdogownersfeelthattheirdogsaretheirbestfriends.Almosteveryonelikesdogsbecausetheytryhardtopleasetheirowners.Oneofmyfavoritestoriesisaboutadogwhowantedtheownertopleasehim.OneofmyfriendshasalargeGermanshepherd牧羊犬namedJack.Thesedogsareoftenveryintelligentclever.EverySundayafternoonmyfriendtakesJackforawalkinthepark.Jacklikestheselongwalksverymuch. OneSundayafternoonayoungmancametovisitmyfriend.Hestayedalongtimeandhetalkedandtalked.SoonitwastimeformyfriendtotakeJackforhiswalkbutthevisitordidn'tleave.Jackbecameveryworriedabouthiswalkinthepark.Hewalkedaroundtheroomseveraltimesandthensatdowndirectlyinfrontofthevisitorandlookedathim.Butthevisitorpaidnoattention.Hecontinuedtalking.FinallyJakcouldn'tstanditanylonger.Hewentoutoftheroomandcamebackafewminuteslater.Hesatdownagaininfrontofthevisitorbutthistimeheheldtheman'shatinhismouth. Germanshepherdsaren'ttheonlyintelligentdogs.AnotherintelligentdogisaSeeingEyedog.Thisisaspecialdogthathelpsblindpeoplewalkalongthestreetsanddomanyotherthings.WecallthesedogsSeeingEyedogsbecausetheyaretheeyesoftheblindpeopleandtheyhelpthemtosee.SeeingEyedogsgenerallygotospecialschoolsforseveralyearstolearntohelpblindpeople. 1Jackcametositinfrontofthevisitorinorderto. A.pleasehim B.bepleased C.askhimtoleaveimmediately D.invitehimforawalk 2WhatdoesitinthesentenceJackcouldn'tstanditanylongerreferto? A.hiswalkingaroundtheroomseveraltimes B.hissittinginfrontofthevisitor C.hisowner'svisitor'ssayingandtalking D.hiswalkinginthepark 3SeeingEyedogs. A.aremoreintelligentthanGermanshepherds B.haveonlyoneeye C.helpblindpeoplegotospecialschools D.helpandseeforblindpeople 4WhichofthefollowingstatementsisRIGHT? A.Mostdogsareveryintelligent. B.ItusuallytakesseveralyearsforSeeingEyedogstolearntohlpblindpeople. C.Germanshepherdsarethemostintelligentdogsintheworld. D.SeeingEyedogscanonlyhelpblindpeoplewalkalongthestreets.
Maryhadfearedthedayshewoulddrawablankduringapresentation.Thenonedayduringa45﹣minutespeechithappened.1.TohelpherselfgetbackontrackMaryaskedtheaudiencetolookatthehandoutandtellherwhattopicwasupnext.Attheendofherpresentationaudiencemembersgavehertopmarksfororganization. WhatIlearnedisthattheaudiencedoesn'tcareifyoumessupandwhattheycareaboutiswhatyouaregoingtodoaboutitMarysaid.MynervousnesswentawaywhenIconcentratednotonmyselfbutinsteadjustthought‘Howismyspeechgoingtohelptheaudience?'2.Everysinglestepofthewayaskyourself‘What'sinitforthem?' ●3. CarteristhefounderofCanada﹣basedpresentationskillstrainingcompany.Whenpossiblehegetstothelocationofhispresentationthedaybeforetomakesurealltheelectronicaidswork.Hewantstoensurethescreenlightingandinputsallworkproperly.Inadditionbuildanextraplanbeforeyoupresent.hesaid. ●Involvetheaudience Whetheryouaregivingaone﹣on﹣onetalkoraspeechinfrontof400peoplethinkstory﹣telling.4.Thewaytoaperson'sheadisthroughhisheart.Sometimesallittakesisafewsecondstoconnectanaudiencememberwithastory. Moreoveronethingthatshockspeoplebackintoattentionistoleaveanalmostuncomfortablylongpause.5. A.Beprepared B.Keeporder C.Sheforgotwhatshewasgoingtosay D.Thatbringsthembacktothespeaker E.Onceyoudothatitgetsridofthefear F.Story﹣tellingmakesmessageseasytoremember G.Storiescombinedataandinformationwithemotion
某同学家买了一个外形非常接近球的西瓜该同学将西瓜均匀切成了8块并将其中一块经抽象后按如图所示的方式放在自已正前方的水果盘中则这块西瓜的三视图是
SomecountriesinEuropeobtainalargeamountofmoneyfromtandannualvisitorsmakegreatcontributionstotheeconomyofthosepopulardestinations.
Thetreesplantedattheendof1990shavebecomeapowerfuldagainststrongwind.
Futuroscopehassomanyshowsactivitiesandgreatsshopsthatitisdifficulttoseethemall.
方程=的解为x=.
假定你是李华你的英国笔友Tom邀请你下周去他们学校参加文化交流活动并向外国朋友介绍中国的传统绘画.但你忙于准备高考不得不谢绝.请根据下面要点用英语写一封信内容包括 谢绝邀请及理由 推荐朋友王伟参加并说明原因. 注意 词数100左右 可以适当增加细节以使行文连贯 注意书信格式. DearTom Yours LiHua.
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现有一组数据14324x.若该组数据的中位数是3则x的值为
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如图四边形ABCD的对角线相交于点O且点O是BD的中点若AB=AD=5BD=8∠ABD=∠CDB则四边形ABCD的面积为
Forasmanyas8000yearsbeforeEuropeancontacttheSanJuanIslandswereinhabitedbytheNorthernStraitsSalishpeoplesandothernativepeopleseasonallypreservingfoodinsummerforwintersspentelsewhere.Allweredrawntotheislandsbytherichabundanceoffoodandmaterialsfoundhere. Inthemid﹣1800sacompanycametotheSanJuanIslandsfollowingitsnumerousinternationaltraderoutes.OneemployeeknownasFridaysettledalonetheareaofwhatisnowthetownofFridayHarbor.ThiscausedmanytorefertotheplaceasFriday'sHarbor. By1900FridayHarborhadapopulationofonlythreeorfourhundredresidents.Roadandtelephonenetworkslinkedthetowntotherestoftheisland.Thecommunitywasgrowingandmanypublicfacilitieshadadded.Whatthesebuildingshadincommonwassimplicityofdesign.Theywereattractiveandfunctionalbutwithoutcomplexdecoration.Typicallybothresidentialandcommercialbuildingswerebuiltwithlocalwood.Moneywassolittlethatitcouldn'tbeusedfortheunnecessaryandsomostbuildingswerepaintedwhitemoreforfunctionalprotectionagainstrotthanfordecoration.Thetownworeapoorlookuntilthelate1960swhentourismretirementrealestate房地产constructiontheartsandavarietyofcottageindustriesbegantotakehold.Todaythetownisagainbusyandbooming.Over6000peopleliveinthetown. Thoughthetraditionalindustrieshaveallbutvanishedtherearestillmanyvisibleremindersofthepioneerera﹣100﹣yearoldorchards果园kitchengardensturn﹣of﹣the﹣centurywoodenbuildingsandcompanionablerooflines﹣allacquaintislandersandvisitorsalikewithFridayHarbor'sspiritedearlydays. 1HowdidtheSanJuanIslandshelptheancients? A.Theyprovidedthemwithatemporaryshelter. B.Theyfunctionedastouristspots. C.TheyprotectedthemfromcolonialEuropeans. D.Theyplayedaroleasaninternationaltradecentre. 2WheredidthenameofFriday'sHarborcomefrom? A.Thenameofthecompany. B.Thedaywhenitwasfound. C.Aninternationaltraderoute. D.Thefirstresidentofthetown. 3WhatdoesParagraph3mainlytellus? A.TheFridayHarbor'sfuture. B.TheFridayHarbor'sdevelopment. C.TheFridayHarbor'spopulation. D.TheFridayHarbor'sarchitect. 4WhatattractsvisitorstotheFridayHarbor? A.Therichabundanceoffood. B.Thebusybutwealthylife. C.Theuniquehistoricsites. D.Thecomfortablecommunity.
I认出了himassoonashecameintotheroom.
Iwasasingleparentoffoursmallchildrenworkingatalow﹣paidjob.Moneywasalways1butwehadaroofoverourheadsfoodonthetable2onourbacks.ItwasChristmastime.We3downtowntoseetheChristmaslightsandenjoyedaspecialdinner4thebigexcitementforthekidswasthefunofChristmas5atthemall购物中心.Theytalkedandplannedforweeksaheadoftime6eachotherwhattheywantedforChristmas. Thebigdayarrived.I7eachofthefourkidsatwenty﹣dollarbillandaskedthemto8forgifts.Theneveryonescattered散开. Backinthecardrivinghomeeveryonewas9aboutChristmaslaughingandaskingeachotheraboutwhattheyhad10.InoticedGingermyyoungerdaughterhadonlyonesmallandflatbagwithher.Icould11enoughthroughtheplastic12totellthatshehadboughtcandybars﹣﹣﹣fifty﹣centcandybars!Whatdidshe13withthattwenty﹣dollarbillIhadgivenher?Iwasso14.AftergettinghomeIcalledherintomybedroomandclosedthedoor.Thiswaswhatshetoldme Iwaslookingaround15ofwhattobuyandI16toreadthelittlecardsononeoftheSalvationArmy'sGivingTrees.Oneofthecardswas17alittlegirlfouryearsoldandallshe18forChristmaswasadollwithclothesandahairbrush.SoItookthecardoffthe19andboughtthedollforher.Wehavesomuchandshedoesn'thaveanything. Myanger20andIhadneverfeltsorichasIdidthatday. 1A.powerful B.tight C.valuable D.available 2A.books B.babies C.bags D.clothes 3A.drove B.ran C.rode D.walked 4A.since B.and C.but D.because 5A.working B.shopping C.eating D.playing 6A.reading B.studying C.helping D.asking 7A.gave B.sent C.passed D.dropped 8A.wait B.beg C.search D.apply 9A.curious B.excited C.careful D.nervous 10A.served B.found C.received D.bought 11A.see B.take C.get D.judge 12A.hairbrush B.card C.bag D.bar 13A.play B.do C.gain D.begin 14A.worried B.satisfied C.happy D.angry 15A.thinking B.reminding C.dreaming D.hearing 16A.regretted B.stopped C.hesitated D.returned 17A.on B.along C.for D.with 18A.wanted B.prepared C.sold D.saved 19A.roof B.window C.tree D.doll 20A.increased B.continue C.lost D.disappeared
HopiIndianTours HopiToursisoperatedfromSecondMesaArizonaontheHopiIndianReservation.ThisisauniquevenueforexperiencingHopiancestrallandsandculture. Overview ExperiencethetruevalueofthesebeautifullandsandlearnhowtheancientwayoftheHopitribe部落hassurvived.AftervisitingHopiculturalsiteseachdayyoucanrelaxwithmulti﹣mediapresentationsofHopihistoryandculture. Visitorinformation Theprimarytouristseasonisinthesummer.Ittendstobecoldandrainyduringtheotherseasons.Summerishotsobringappropriateclothing.Ourtoursincludewalkingsoweencouragetourparticipantstobringcomfortablefootwear.AnumberofguidebooksincorrectlystatethatvisitorsarerequiredtoobtainpermissionbeforeenteringtheHopiReservation.HoweverpermitsarerequiredforvisitingparticularareasontheHopiReservationthatmaybeculturallysensitive. EntrancefeesHalfdayFullday Adults$60$100 Children5﹣17$30$50 Group20ormore$40$70Childrenunder5free Allratesincludeaguide.Additionalratesforweekendtoursarenotedbelow.Thereareextrachargesiftransportationmealsorlodging住宿arerequired.CallHopiReservationInformation928324﹣6839. Weekendtours VisitHopiancestralsites.Youwillseetraditionalarts&craftsandmeetHopicraftsmen.VisittheHopiCulturalCentertotastevariousHopifoods.WeekendtoursincludeSaturdaynightlodgingtourluncheswithHopisnackstransportationandentrancefeeseveningpresentationstourguidesandtraditionaldinner. $300perperson. Artsandcrafts PotteryrugsanddollscanbepurchasedthroughouttheHopiReservationinshopsandgalleries. Lodginganddining Thereisonemotel汽车旅馆ontheReservationtheHopiCulturalCenterMotel.Call928734﹣6493forreservations.Thereisanovernightcampgroundnextdoorlimitedtoatwo﹣nightstay.Thereareanumberofdiningfacilities设施andtake﹣outshopsontheHopiReservation.AlargerestaurantservingAmericanandtraditionalHopifoodislocatedattheHopiCulturalCenter.Severalfamiliesineachvillageservefoodfromtheirhomes﹣lookoutforsignsintheirwindows. 1Whatisplannedattheendofeachtour? A.Alecture. B.AHopidinner. C.Apresentation. D.Ashoppingtrip. 2Wheredoyouneedpermissiontogo? A.Thegalleries. B.Hopivillages. C.Culturallysensitiveareas. D.TheHopiCulturalCenter. 3Howmuchwillacouplepayforaweekendtour? A.$160. B.$200. C.$400. D.$600. 4WhatcanyoudoontheReservation? A.Campfortwonights. B.TryonHopicostumes. C.Meetthetribeleaders. D.MaketraditionalHopifood.
若关于x的不等式组有解则在其解集中整数的个数不可能是
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