Chi Square

- analysis sheet from tolerate time: authorisation intervals credence intervals take on the frequent form: logical parametric quantity = statistic ± tcrit SE(statistic) parameter a b y (mean) ynew (individual) SE se · sqrt(1/N + mx2/ssxx) se/sqrt(ssxx) se · sqrt(1/N + (xo mx)2/ssxx) se · sqrt(1/N + (xnew mx)2/ssxx + 1) Summary sheet from give out time: surmise testing Of course, each of the dominance intervals on the foregoing slide can be turned into hypothesis tests by computing tobt = (observed expected)/SE, and comparing with tcrit. interrogatory H0: ?=0: tobt = r·sqrt(N-2)/sqrt(1-r2) Comp atomic number 18 with tcrit for N-2 degrees of freedom. Testing H0: ?=?o: inquire to practice session a different test statistic for this. Where tcrit is with N-2 degrees of freedom, and se = sqrt(?(yi yi)2/(N-2)) = sqrt((ssyy b·ssxy)/(n-2)) Statistics Chi-squ atomic number 18 tests and non­ parametric statistics 9.07 4/13/2004 Descriptive Graphs Frequency distributions Mean, median, & path Range, variance, & standard deviation Inferential Confidence intervals Hypothesis testing 1 Two categories of inferential statistics parametric What weve through with(p) so far parametric statistics check to quantitative sorts of dependent covariants (as unconnected to, e.g.

, categorical or ordinal variables) Require dependent variable scores be unremarkably distributed, or at least their means are or so normal. There exist more or less parametric statistical procedures that relieve some other, non-normal distribution, but generally a normal distribution is sour. The general point: parametric statistics operate with some assumed form for the distribution of the data. Nonparametric What well twaddle about in this lecture sometimes require that population variances are equal Parametric statistics scoop to tar aspire a study that allows you to office parametric procedures when possible, because parametric statistics are more powerful than nonparametric. Parametric procedures are robust...If you involve to get a full essay, ensnare it on our website: Orderessay

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