Sunday, December 8, 2013

Res342

RES 342 - Research and Evaluation II hebdomad 2 Notes 1.0 shot Test for a Single world Mean, thin try size of it When a sample size (n) is atrophied [less than 30, according to the precept of thumb for the Law of Large numbers racket (Central Limit Theorem)], the dissemination of the property (characteristic) of interest of the underlying creation is non cognise to be usual, and the population beat aberrancy (?) is non k forthwithn, for a hypothesis rivulet on the mean we essential using up the t dispersal with (n - 1) degrees of freedom preferably of the z distribution for the test statistic, which becomes a t-statistic [pic] since the population standard deviation (?) is not known and is estimated with the sample standard deviation (s). standardized the z-statistic tests we analyze in Week 1, t-statistic tests may be one-tailed or two-tailed, and are conducted chase the Five-Step Procedure for surmise test we introduced in Week 1. The only diff erences are that the z-statistic changes to a t-statistic, and we now use the t distribution instead of the standard normal (z) distribution to retrieve the critical value or the p-value. 2.0 opening Test for a Single Population Proportion cipher we are fire in testing the value of the correspondence (?) possessing an attribute (characteristic) of interest in a single population.
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An recitation could be, the proportion of drinkers of a trusted cola who prefer nutriment over regular. The sample calculator of ? is the sample proportion (p). p = [number in the sample possessing the attribute (charac teristic) of interest] / (number in the sam! ple) The variance of a population proportion (?) is ?2 = ? ? (1 - ?), so the test statistic is [pic] Like other z-statistic tests, these tests may be one-tailed or two-tailed, and are conducted following the Five-Step Procedure for Hypothesis Testing we introduced in Week 1. 3.0 Hypothesis Test for Two Population Means, Large Sample Size Now suppose we are interested in...If you want to make water a full essay, order it on our website: OrderCustomPaper.com

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