.iResearchers are interested in depressed individuals who are no study, the researchers sample 18 patients from their own private clinics whose responded to treatment. Half received one intravenous dose of ketamine, a hypothesized q for depression; half received one intravenous dose of placebo. Far more of the patients who received'fketamine improved, as measured by the Hamilton Depression Rating Scale, usually in less than 2 hours, than patients on placebo. t responding to treatment. For their depression had not uick fix Would random selection have been possible? Why or why not? (*Be sure to thoroughly explain your choice.) Edit View insert Format Tools Table 12pt v Paragraph v i B I U