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To calculate the t statistic, you first need to estimate the population variance. You can estimate the population variance by calculating a weighted sample variance
To calculate the t statistic, you first need to estimate the population variance. You can estimate the population variance by calculating a weighted sample variance (s(XX) ). The pooled estimate of the standard deviation is . The value of the test statistic is t = . (Hint: For the most precise results, retain four decimal places from your previous calculation to calculate the t statistic.)
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