Stats Question???

Question

A sociologist is studying the effect of having children within the first two years of marriage on the divorce rate. Using hospital birth records, she selects a random sample of 200 couples who had a child within the first two years of marriage. Following up on these couples, she finds that 80 couples are divorced within five years.

To determine if having children within the first two years of marriage increases the divorce rate we should test
Question 3 answers
a)Hypotheses H0: p = 0.50, Ha: p≠ 0.50.
b)Hypotheses H0: p = 0.50, Ha: p > 0.50.
c)Hypotheses H0: p = 0.50, Ha: p < 0.50.
d)Hypotheses H0: p = 0.40, Ha: p > 0.40.
e)None of the above are suitable hypotheses, as p0 is unknown.

I think it is e, but I am not sure.

Answer 1

b