A psychologist at a private mental heaith facility was asked to determine whether there was a clear difference in the length of stay for patients with different categories of diagnosis. Looking at the last seven patients in each of the three major categories, the results {in terrns of weeks of stay) were as follows. Using the data below, test whether the length of stay for patients vary based on category of diagnosis. Diagnosis Category Aective Disorders Cognitive Disorders Drag-related Conditions T 3 1t} 12 1t} ll 12