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Unformatted text preview: and females. From the sample proportions we females are more in favor (.737 or 73.7% for females versus .538 or 53.8% for males). Details for the "two-sample z-test" for comparing two proportions The test statistic used by Minitab is For Example 3, denominator The book uses a "pooled version" in which the two samples are combined to get a pooled proportion p. That value is used in place of both and in the part thats under the square root sign. We will use the Minitab method since the denominator in the calculation is the standard error that we could use to create conficence intervals. Just to illustrate the book method, in example 3, the pooled p-hat = (185+107)/(251+199) = 292/450 = .649. The pooled version of z works out to be z = 4.40 (and p-value is still 0.000)....
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This note was uploaded on 05/31/2011 for the course STAT 200 taught by Professor Andyregards during the Spring '11 term at World College.
- Spring '11