A Certain HMO Is Attempting to Show the Benefits of Managed

Multiple Choice

A certain HMO is attempting to show the benefits of managed care to an insurance company. The HMO believes that certain types of doctors are more cost-effective than others. One theory is that certification level is an important factor in measuring the cost-effectiveness of physicians. To investigate this, the HMO obtained independent random samples of 25 physicians from each of the three certification levels-Board certified (C) ; Uncertified, board eligible (E) ; and Uncertified, board ineligible (I) -and recorded the total per-member, per-month charges for each (a total of 25 physicians) . In order to compare the mean charges for the three groups, the data will be subjected to an analysis of variance. Write the null hypothesis tested by the ANOVA.

A) H0: μC = μE = μI
B) H0: β1 = β2 = β3 = 0
C) H0: μC = μE = μI = 0
D) H0: p1 = p2 = p3