B) a 5m diameter cylindrical tank is emptied by a constant outflow of 1.0m3/min. a two-position controller is used to open and close a fill valve with an open flow of 2.0m3/min. for level control the neutral zone is 1.0m [or hysteresis ±0.5m] and the set point is 12.0m. sketch the level versus time and calculate the cycling period

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