(Table: Light Therapy) Sit and colleagues (2018) investigate…
(Table: Light Therapy) Sit and colleagues (2018) investigated the efficacy of adjunctive bright-light therapy in patients with bipolar disorder. Patients were randomly assigned to receive either bright-light therapy or dim-light therapy along with their regular medication. After six weeks, patients’ clinical status was coded as improved or not improved. (a) Calculate the chi-square statistic for a test of independence to determine the effects of the type of light therapy on the patients’ clinical outcomes, and interpret what this result means. (b) Calculate the effect size for this test, though you don’t have to interpret the effect. The data appear in the table.Table: Light Therapy Improved Not Improved Bright Light 15 8 Dim Light 4 19