Over a 3-month period, among 66 people with a sleep disorder, patients who were given a high dose (823 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 a) Identify whether the above research is an observational study or an experiment. The described research is an b) Identify the subjects studied. OA. The subjects are the population of people with a sleep disorder. OB. The subjects are 66 people with a sleep disorder. OC. The subjects are certain dietary supplements. D. The subjects are sleep disorders. c) Identify the factor(s) in the experiment, and the number of levels for each. How many factors are involved in this experiment? (Type a whole number.) In the table below, name the factor(s) and the number of levels of each. Factor d) Identify the number of treatments. This experiment used treatments. (Type a whole number.) e) Identify the response variable measured. The response variable is f) Identify the design (completely randomized, blocked, or matched) This experiment has a(n) design. g) Identify whether the experiment was blind (or double-blind). OA. This experiment is single-blind. The subjects were blinded. OB. This experiment is double-blind. Number of Levels (Type a whole number.) C. This experiment is single-blind. The evaluators were blinded. OD. 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. OA. The experiment has determined that the dietary supplement causes improvements in patients with the sleep disorder. B. 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 sleep disorder, at least over the short term OC. 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 sleep disorder, at least over the short term.