In a left-ailed test comparing two means with variances unknown but assumed to be equal,the sample sizes were n₁ = 8 and n₂ = 12.At $\alpha$ = .05,the critical value would be: A) -1.960 B) -2.101 C) -1.734 D) -1.645

Question

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For a left-tailed test with unknown but equal variances, the t-distribution is used. With degrees of freedom df = n1 + n2 - 2 = 18, the critical value at α = 0.05 is approximately -1.734.

In a Left-Ailed Test Comparing Two Means with Variances Unknown α\alphaα

In a Left-Ailed Test Comparing Two Means with Variances Unknown $\alpha$