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(See Steps) Recent research indicates that the effectiveness of anti-depressant medication is directly related to the severity of the depression (Khan,

Question: Recent research indicates that the effectiveness of anti-depressant medication is directly related to the severity of the depression (Khan, Brodhead, Kolts, and Brown 2005). Based on pre-treatment 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. Do the data indicate significant differences among the four levels of severity using an α = 0.05?

Low Moderate High Moderate Moderately Severe Severe
0 1 4 5
2 3 6 6
2 2 2 6
0 2 4 3

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