Sterre charges \$35$35dollar sign, 35 to file tax returns, but files for free if she only needs the easiest form. Then she donates \$2$2dollar sign, 2 to clean water projects per tax return she files. Sterre charged \$7{,}245$7,245dollar sign, 7, comma, 245 and made a donation of \$1{,}242$1,242dollar sign, 1, comma, 242 this year for the tax returns she filed. How many tax returns did Sterre file at each price?
Sterre filed
tax returns for free and filed
tax returns for \$35$35dollar sign, 35 each.

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