Statistics is a mathematical science including methods of collecting, organizing and analyzing data in such a way that meaningful conclusions can be drawn ...HomeFreeMathematicsTutorialsreportthisadSearchHere:  MoreInfoPopularPagesElementaryStatisticsandProbabilityTutorialsandProblemsProbabilityQuestionswithSolutionsStatisticsandProbabilityProblemswithSolutions-sample3BoxplotsinStatisticsStatisticsandProbabilityProblemswithAnswersreportthisadIntroductiontoStatisticsWhatisStatistics?Statisticsisamathematicalscienceincludingmethodsofcollecting,organizingandanalyzingdatainsuchawaythatmeaningfulconclusionscanbedrawnfromthem.Ingeneral,itsinvestigationsandanalysesfallintotwobroadcategoriescalleddescriptiveandinferentialstatistics.Descriptivestatisticsdealswiththeprocessingofdatawithoutattemptingtodrawanyinferencesfromit.Thedataarepresentedintheformoftablesandgraphs.Thecharacteristicsofthedataaredescribedinsimpleterms.Eventsthataredealtwithincludeeverydayhappeningssuchasaccidents,pricesofgoods,business,incomes,epidemics,sportsdata,populationdata.Inferentialstatisticsisascientificdisciplinethatusesmathematicaltoolstomakeforecastsandprojectionsbyanalyzingthegivendata.Thisisofusetopeopleemployedinsuchfieldsasengineering,economics,biology,thesocialsciences,business,agricultureandcommunications.IntroductiontoPopulationandSampleApopulationoftenconsistsofalargegroupofspecificallydefinedelements.Forexample,thepopulationofaspecificcountrymeansallthepeoplelivingwithintheboundariesofthatcountry.Usually,itisnotpossibleorpracticaltomeasuredataforeveryelementofthepopulationunderstudy.Werandomlyselectasmallgroupofelementsfromthepopulationandcallitasample.Inferencesaboutthepopulationarethenmadeonthebasisofseveralsamples.Example1Acompanyisthinkingaboutbuying50,000electricbatteriesfromamanufacturer.Itwillbuythebatteriesifnomorethat1%ofthebatteriesaredefective.Itisnotpossibletotesteachbatteryinthepopulationof50,000batteriessinceittakestimeandcostsmoney.Instead,itwillselectfewsamplesof500batt