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.