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Use the t-distribution table to find the critical values for the indicated alternative hypothesis, level of significance, a and sample size n1 and n2. Assume that the sample are independent, normal and random. Ha: u1 < u2, a = 0.25, n1 = 9, n2 =6.

a) Find the critical values assuming that the population variance are equal.

b) Find the critical values assuming that the population variance are not equal.

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