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

Two researchers are attempting to create a new psychotherapy protocol that more reduces panic attacks. they believe that they have succeeded and are now in the clinical trial period of their protocol's development. they are working with several cohort groups, some of which have been through the new protocol, while others have done the standard protocol currently recommended. if these researchers are interested in evaluating the difference in the percentage of test subjects who successfully decreased their panic attacks in 2 months on the new protocol versus the percentage of test subjects who successfully decreased their panic attacks in 2 months with the traditional protocol, which of the following statistical tests would be most appropriate? a. analysis of variance (anova) b. correlation c. chi-square test d. paired t-test e. independent t-test