Recall our previous work with the HPV virus. HPV is a group of more than 150 types of related viruses. About ⅓ of HPV viruses are sexually transmitted. Only a few cause cancer. A recent pair of studies claim that about half of adult men and one quarter of adult women are infected with HPV. (Sources: HPV Infection Common Among American Females, ScienceDaily, Feb. 28, 2007 and How Many Men Have HPV?, Population Reference Bureau, May 2011). Suppose that we use the data one of these studies to calculate the 90%, 95%, and 99% confidence intervals for the difference in male and female infection rates. Which interval is the 90% confidence interval?

Group of answer choices

0.201 to 0.299

0.192 to 0.308

0.174 to 0.326