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AP Statistics Interpretations Flashcards

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6623380269describing and comparing distributioncenter, shape, spread, context, compare (if necessary)0
6623382649z-scorethe number of standard deviations above or below the mean1
6623383356correlation (r)the strength and direction of a linear association between two quantitative variables2
6623384771coefficient of determination (r^2)the fraction of variation in the y-values (in context) explained by the LSRL of y on x (in context)3
6623387664slope of LSRL (b)as the x-variable increases by 1 unit, the y-variable is predicted to increase/decrease by an average of b y-units4
6623391489y-intercept of LSRL (a)when x is 0 x-units, the y is predicted to be a y-units5
6623459998standard deviation of the residuals (s)the average distance of each observed y-value from the LSRL (the average prediction error)6
6623462120standard deviationthe average distance of each observation from the mean7
6623463036expected valueif you were to repeat the random process many times, the mean number of ___________ (variable) would be about _______ (expected value) in the long run.8
6623475752probabilitythe long term relative frequency of an event (in context) occurring9
6623478198independent eventstwo events that have no effect on each other; P(A|B) = P(A), P(B|A) = P(B)10
6623480421mutually exclusive eventsdisjoint events; two events that cannot occur at the same time; P(A and B) = 011
6623482472confidence intervalWe are ____% confident the interval between _____ and ____ will capture the true ____________________________.12
6623483554confidence levelIn the long run, about ____% of intervals calculated from samples of the same size from the same population will capture the true ______________________________________.13
6623486519p-valueIf the null is true (in context), the probability of obtaining results at least as extreme as the sample is _________ (p-value).14
6623490813if the p-value is less than alpha,we reject the null and accept the alternative. There is evidence of the alternative (in context).15
6623493268if the p-value is greater than alpha,we fail to reject the null and fail to accept the alternative. There is no evidence of the alternative (in context).16
6623494320Type 1 Errorrejecting a true null; We rejected the null and accepted the alternative when the null was actually true; Describe a consequence in context.17
6623497699Type II Errorfailing to reject a false null; We failed to reject the null and did not accept the alternative when the null was actually false; Describe a consequence in context.18
6623500236powerThe probability of rejecting the null given that the alternative is true (in context) is _______(power).19

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