For a research study measuring the effect of two treatments, the sample sizes are n1 = 8 in one treatment and n2 = 10 in the other treatment, and the pooled variance is 1.23. The sample means are M1 = 21.2 and M2 = 24.1, with corresponding population means of μ1 = 21.2 and μ2 = 23.7. Using a two-tailed t test, determine the t value for α = .05 and make a conclusion about the null hypothesis.