6. [4 marks] The following data were collected in a multisite observational study of medi- cal effectiveness in Type II diabetes. These sites were involved: a healthy maintenance organization (HMO), a university teaching hospital (UTH), and an independent prac- tice assumption (IPA). The following data display the treatment regimens of patients measured at baseline by site. (a) [2 marks] Use the data to test that no difference in treatment regimens across sites. (in addition, calculate the expected frequency for each cell.) (b) [2 marks] Is there any difference between levels of oral Hypoglycemic and site of UTH (use partitioning method) (c) [2 marks] Redo the analyses of Part (a) by excluding oral Hypoglycemic. (keep all three levels of Site) Treatment regimen Site Diet oral Hypoglycemic Insulin Total HMO 294 827 579 1700 UTH 132 288 352 772 IPA 189 516 404 1109 Total 615 1631 1335 3581