a. What is the value of the​ pooled-variance tSTAT test statistic for testing H0: μ1=μ2​?   tSTAT= ​(Round to two decimal places as​ needed.)   b. In finding the critical​ value, how many degrees of freedom are​ there?     degrees of freedom= ​(Simplify your​ answer.)   c. Using a significance level of α=0.005​, what is the critical value for a​ one-tail test of the hypothesis H0: μ1≤ μ2 against the alternative H1: μ1>μ2?   The critical value is=

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