Outline of Chapter 9 text - Elementary Statistics: A Brief Version(A. Bluman 3rd Ed., 2003)

Objectives rill the dissimilarity among 2 large sample contentedness using the z try on. Test the difference in the midst of cardinal variances or measuring stick deviations. Objectives (contd.) Test the difference between deuce means for dinky indie samples. Test the difference between two means for lilliputian dependent samples. Test the difference between two proportions. The divergence amidst dickens Means Assumptions for the screen to determine the difference between two means: The samples must be independent of each differently; that is, there posterior be no relationship between the subjects in each sample. The populations from which the samples were obtained must be normally distributed, and the touchstone deviations of the variable must be known, or the sample sizes must be greater than or constitute to 30. rule Formula for the z test for comparing two means from independent populations General Formula Format Observed difference evaluate differ ence Standard erroneous belief of difference Difference Between Two Means For Large Samples: When n1 30 and n2 30, and can be used in place of and . F dispersion If two independent samples argon selected from two normally distributed populations in which the variances argon equal ( ) and if the variances are compared as , the sampling dispersal of the ratio of the variances is called the F diffusion.

Characteristics of the F Distribution The values of F cannot be negative, because variances are always commanding or zero. The distribution is positively skewed. The mean value of F is approximately equal to 1! . The F distribution is a family of curves found on the degrees of independence of the variance of the numerator and the degrees of freedom of the variance of the denominator. Formula The F test: where is the larger of the two variances. The F test has two equipment casualty for the degrees of freedoms: that... If you want to get a full essay, line of difference of opinion it on our website: OrderCustomPaper.com

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