- Our Null Hypothesis states that there is no difference between the two groups:
H0 : μ1 = &mu2
- Our Alternative Hypothesis (which must be true if the Null is false) states that there is a difference between the two groups:
H1 : μ1 ≠ μ2
- Degrees of Freedom (df) for a t test is (N1+N2-2). IOW: the number of subjects in group 1 plus the number of subjects in group 2 minus 2.
df = 17 + 15 – 2 = 30