# STAT 503 Quiz I

 The flashcards below were created by user MRK on FreezingBlue Flashcards. discrete type of quantitative variable that can not be divided (whole # only) Tail to the left skewed left If histogram is symmetric... mean and median are similar If histogram is asymmetric median is... more useful than mean 5 Number summery minmaxQ1 medianQ2 outlier 1.5*IQR +/- Q1/3 Standard Deviation how are on average samples are from the mean Sample Variance Square of the Sample standard Deviation Coefficient of Variation gives a unitless quantityit is sd/ȳhard when close to zeroneed non-negative When bell shaped: +/- 1 SD has ___ % +/- 2 SD has ___ % +/- 3 SD has ___ % 689599 linear transformation linear = 1 multiplicative factor & 1 additive factorFor means: use same formulaFor SD: additive factor is cancelled and just want absolute value of multiplicative For Variance: square the multiplicative Frequency Interpretation Interpreting probability that you would actually experiment each timeNot the only way to interpret Probability of non-overlapping events OR events add P{1} + P{2} Probablility of independent events AND events P{1}*P{2} For simultaneous events visualize with... venn diagram For sequential events visualize with... Probability trees(medical tests)AND events sensitivity v. specificity sensitivity- % true positivesSpecificity- % True negatives Pr(x|y) Pr(x*y) / Pr(y) AuthorMRK ID258703 Card SetSTAT 503 Quiz I DescriptionStuff Updated2014-02-12T22:00:20Z Show Answers