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When testing for the difference between two population means and the population variances are unknown, a t test is used.
Q32: A 90% confidence interval estimate of
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Q33: a. Apply exponential smoothing with w
Q65: The standard deviation of a sampled population
Q67: The following data are believed to
Q71: A professor of economics wants to
Q103: Of the values for a chi-squared test
Q111: The chi-squared test of a contingency table
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Q149: The variance of the error variable,