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28 Macmillan Learning a Suppose a researcher runs a t test of the difference of...

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28 Macmillan Learning a Suppose a researcher runs a t test of the difference of two independent means The samples are taken from populations of unknown variances that are not assumed to be equal The sample sizes and standard deviations are summarized in the table Sample Group Sample size m 22 m 47 df standard deviation 83 8742 32 5 7356 Use software to compute the Welch Satterthwaite approximation of the degrees of freedom df You might find some software manuals useful Give your answer precise to at least three decimal places Attemp

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