Confidencelevelandconfidenceintervalarefundamentalconceptsinstatisticsusedtoexpressthereliabilityofanestimate.Theconfidencelevel,expressedasapercentage(e.g.,95%),indicateshowoftenthetrueparameterwouldfallwithinthecalculatedintervalifthesamestudywererepeatedmultipletimes.Ahigherconfidencelevelimpliesgreatercertaintybutresultsinawiderinterval.Theconfidenceinterval(CI)providesarangeofvalueswithinwhichthetruepopulationparameterislikelytolie,basedonsampledata.Forexample,a95%CIforameansuggeststhatifthesamplingprocesswererepeated,95%ofthecalculatedintervalswouldcontainthetruepopulationmean.Theseconceptsarewidelyappliedinhypothesistesting,surveyanalysis,andscientificresearchtoquantifyuncertaintyandsupportdata-drivenconclusions.
