Question

One-tailed test; variance is unknown, α = 0.05, n = 15

Answer 1

Based on the information provided, the significance level is $\alpha = 0.05,$ $df=n-1=14$ degrees of freedom and the critical value for a left-tailed one-tailed test is $t_c = -1.76131.$

Based on the information provided, the significance level is $\alpha = 0.05,$ $df=n-1=14$ degrees of freedom and the critical value for a right-tailed one-tailed test is $t_c = 1.76131.$