Sandra orders two trucks of water for her pool. The first truck begins filling the pool at a rate of 60 gallons per minute. The second truck arrives 35 minutes later and starts filling the pool at a rate of 80 gallons per minute. Sandra's pool holds 4,200 gallons of water. The equation 60+80(−35)=4,200 models this situation. How many minutes, m, will it take for both trucks to fill Sandra's pool?

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