Which of the following specify legitimate pairs of null and alternative hypotheses? a. H0: p = 0.25

Question:

Which of the following specify legitimate pairs of null and alternative hypotheses?
a. H0: p = 0.25 Ha: p > 0.25
b. H0: p < 0.40 Ha: p > 0.40
c. H0: p = 0.40 Ha: p < 0.65
d. H0: p ≠ 0.50 Ha: p = 0.50
e. H0: p = 0.50 Ha: p > 0.50
f. H0: = 0.25 Ha: > 0.25