ECMT1010 Lecture Notes - Lecture 4: Sampan, Confidence Interval
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The process ofdrawing a conclusion about a population using informationfrom a sample. Asample statistic is used tomake an inferenceabout a corresponding population parameter sampling. Satanic callalsobecalled pointimate p what we vanttoknow is thepopulation parameter. Toei quite b s p d same sampan. As it dependshow muchthestatistic varies fromsample tosample plotthesamplestatistics togeta samplingdistibution distribution ofsamplestatistics computed from many different random samples ofthe shows us howthesample statistic variesfrom sampletosample samesize from thesame population softest. What will a samplingdistribution look like entre if thesamplesare randomly selectedthe sampling distribution will be centered around the population parameter ape formostofthestatisticsweconsiderif thesamplingsize be symmetrical and islarge enoughthesamplingdistribution bell shaped a he. Imean centreshape areimportant 13 main interest variabilityof id. Odds if p reliability of a statistic depends on how much it variesfrom sample sample. I standarderror1st ofthestatistic a s e isthe standarddeviation of the samplestatistic more spread out a less reliable pl samplingdistribution. Inference statistical n interval estimate gives a rangeofplausiblevaluesfor a populationparameter.