We are interested in significant differences (level α = 0.05) between the expected values µ1 and µ2 of two populations. Which of the following statements on statistical tests are correct? a) We will...

We are interested in significant differences (level α = 0.05) between the expected values µ1 and µ2
of two populations. Which of the following statements on statistical tests are correct?
a) We will formulate the null hypothesis as µ1 = µ2.
b) A t-test can always be applied in this situation.
c) A p-value is the probability that the null hypothesis is correct, given the observed data.
d) If we obtain a p-value of 0.04, we will reject (level α = 0.05) the null hypothesis.