Null: mu1 ≥ mu2; Alternative: mu1 < mu2 Null: mu1 ≤ mu2; Alternative: mu1 > mu2 Null: mu1 = mu2; Alternative: mu1 ≠ mu2 B. The value of the test statistic is 178.32 13.11 1.90 C. The test statistic is a t-score chi-square statistic z-score

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