(548 mg/day) of a certain dietary supplement improved more than those given a placebo. The researchers kept track of and were aware of the dosages of supplements and placebos. Complete parts a through h. E) I Over a 4-month period, among 94 people with a psychological disorder, patients who were given a high dose i l i i l a) identify whether the above research is an observational study or an experiment. The described research is an _ b) Identify the subjects studied. O A. The subjects are certain dietary supplements. O B. The subjects are psychological disorders. 0 C. The subjects are 94 people with a psychological disorder. 0 D. The subjects are the population of people with a psychological disorder. 0) Identify the factor(s) in the experiment, and the number of levels for each. How many factors are involved in this experiment? '1 (Type a whole number.) In the table below, name the factor(s) and the number of levels of each. Factor Number of Levels E d) Identify the number of treatments. E (Type a whole number.) This experiment used D treatments. (Type a whole number.) 9) Identify the response variable measured. f) identify the design (completely randomized, blocked, or matched). This experiment has a(n) 'VV design. 9) Identify whether the experiment was blind (or double-blind). O A. This experiment is doubleblind. O B. This experiment is single-blind. The subjects were blinded. O C. This experiment is singleblind. The evaluators were blinded. O D. It is not known whether any blinding occurred. h) Identify the nature and scope of the conclusion regarding what the results of the experiment may or may not indicate. O A. The experiment design needs to include replication and double-blinding. As it is, the experiment cannot determine whether or not the dietary supplement causes improvements in patients with the psychological disorder, at least over the short term. 0 B. The experiment has determined that the dietary supplement causes improvements in patients with the psychological disorder. 0 C. The experiment needs to be replicated and include double-blinding, but it can determine whether or not the dietary supplement causes improvements in patients with the psychological disorder, at least over the short term