Question: Pregnancy, II. The San Diego reproductive clinic in Exercise wants to publish updated information on its success rate.
a) The clinic wants to cut the stated margin of error in half. How many patients' results must be used?
b) Do you have any concerns about this sample? Explain.
Exercise: Pregnancy. In 1998 a San Diego reproductive clinic reported 49 live births to 207 women under the age of 40 who had previously been unable to conceive.
a) Find a 90% confidence interval for the success rate at this clinic.
b) Interpret your interval in this context.
c) Explain what "90% confidence" means.
d) Do these data refute the clinic's claim of a 25% success rate? Explain.