Postpartum depression and anxiety (PPD), is a common medical
condition affecting mothers and their families after the birth of a
baby. The CDC estimated that 16% of women who have recently
given birth suffer from PPD. However, this research only reflected
self-reported cases. Therefore, one group dedicated to helping
women and their families with PPD believes that the true percentage
of women who suffer from PPD is much higher. The group conducts a
simple random sample of 139 women who had given birth in the
last year and discovers that 31 of them report having PPD.
Based on this evidence, can the group claim that the true
percentage of women who have PPD is greater than 16 % ? Use a
0.05 level of significance.
Step 1 of 3: State the null and alternative hypotheses for the
test. Fill in the blank below.
H0: p=0.16
Ha: p⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯0.16
Step 2 of 3:
Compute the value of the test statistic. Round your answer to
two decimal places.
Step 3 of 3:
Draw a conclusion and interpret the decision.