Five friends have access to a chat room. is it possible to determine who is chattingif the following information is known? either kevin or heather, or both, are chatting. either randyor vijay, but not both, are chatting. if abby is chatting, so is randy. vijay and kevin are either bothchatting or neither is. if heather is chatting, then so are abby and kevin. explain your reasoning

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