For each of the following situations, suppose H0: 1 = 2 is being tested against HA: 1

Question:

For each of the following situations, suppose H0: µ1 = µ2 is being tested against HA: µ1 > µ2. State whether or not there is significant evidence for HA.
(a) ts = 3.75 with 19 degrees of freedom, α = 0.01.
(b) ts = 2.6 with 5 degrees of freedom, α = 0.10.
(c) ts = 2.1 with 7 degrees of freedom, α = 0.05.
(d) ts = 1.8 with 7 degrees of freedom, α = 0.05.