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Question 6)  Given that, n1 = 25 and n2 = 23 confidence level = 0.90 => significance level (\alpha) = 1 - 0.90 = 0.10 1-\alpha / 2=1-0.10 / 2=1-0.05=0.95 Degrees of freedom = min (n1 - 1, n2 - 1)  => Degrees of freedom = min (25 - 1, 23 - 1) => Degrees of freedom = min (24, 22) => Degrees of freedom = 22 To calculate the critical value we should use : qt (0.95, df = 22)   ...