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Consider two samples from two normal populations: 24 25 24 25 23 27 23 28 27 25 and 21 17 21 22 14 14 21

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Consider two samples from two normal populations: 24 25 24 25 23 27 23 28 27 25 and 21 17 21 22 14 14 21 26 21 26 23 21 Suppose we wish to test Ho H1 - H2 = 9 against Ha 1 - H2 # 9 using the degrees of freedom (Note 7.9 of the text): n1 df = (s; / n1 ) ($3 / n2) + n1 - 1 n2 - 1 This is sometimes referred to as the Welch test. Select the following correct choices:

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