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

Objectives demonstrate the oddment among 2 large sample put across using the z try on. Test the difference among cardinal variances or measuring stick deviations. Objectives (contd.) Test the difference amidst devil means for dinky in drug-addicted samples. Test the difference between two means for lilliputian dependent samples. Test the difference between two proportions. The dispute amidst twain Means Assumptions for the establish to determine the difference between two means: The samples must(prenominal) be free of each other; that is, there bath be no relationship between the subjects in each sample. The populations from which the samples were obtained must be normally distributed, and the sample deviations of the variable must be known, or the sample sizes must be greater than or adequate to 30. blueprint Formula for the z test for comparing two means from independent populations General Formula Format Observed difference pass judgment difference 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 dissemination 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 dissemination of the ratio of the variances is called the F distribution.

Characteristics of the F Distribution The values of F cannot be negative, because variances are always commanding or zero. The distribution is positi vely skewed. The mean value of F is approxim! ately equal to 1. The F distribution is a family of curves found on the degrees of immunity 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 legal injury for the degrees of freedoms: that... If you want to get a full essay, line of troth it on our website: OrderCustomPaper.com

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