For a research study measuring the effect of two treatments, the sample sizes are n 1 = 8 in one treatment and n 2 = 10 in the other treatment, and the pooled variance is 1.23.

For a research study measuring the effect of two treatments, the sample
sizes are n 1 = 8 in one treatment and n 2 = 10 in the other treatment, and the pooled variance is 1.23. The sample means are M 1 = 21.2 and M 2 = 24.1, with corresponding population means of μ1 = 21.2 and μ2 = 23. Using a two-tailed t test, determine the t value for α = .05 and make a conclusion about the null hypothesis.

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