4 ' _ _ ' '_ - ' . Recent research indicates that the effectiveness of antidepressant medication is directly related to the severity of the depression (Khan, Brodhead, Kolts & Brown, 2005). Based on pretreatment depression scores, patients were divided into four groups based on their level of depression. After receiving the antidepressant medication, depression scores were measured again and the amount of improvement was recorded for each patient. The following data are similar to the results of the study. Using your statistical software --ackae, run the inde-endent-measures sinle-factor ANOVA for this data: --- Moderate Moderate Severe Severe 2 - .2.1 The data can also be downloaded in serial format using this link: Download CSV Fill in the summary table for the ANOVA test: war TLW ll TOTAL - From this wtable, obtain the necessary statistics for the ANOVA: F-ratio: l p-value: _ 7223 What is your final conclusion? Use a significance level of a = 0.01. I IIIH E 0 These data do not provide evidence of a difference between the treatments 0 There is a significant difference between treatments (Report P-value, Fratio & MS-s accurate to 3 decimal places and all other values accurate to 2 decimal places.)