A Physician and President of a Tampa Health Maintenance Organization

question 1

Multiple Choice

A physician and president of a Tampa Health Maintenance Organization (HMO) are attempting to show the benefits of managed health care to an insurance company.The physician believes that certain types of doctors are more cost-effective than others.To investigate this,the president obtained independent random samples of 20 HMO physicians from each of 4 primary specialties - General Practice (GP) ,Internal Medicine (IM) ,Pediatrics (PED) ,and Family Physicians (FP) - and recorded the total charges per member per month for each.A second variable which the president believes influences total charges per member per month is whether the doctor is a foreign or USA medical school graduate.To investigate this,the president also collected data on 20 foreign medical school graduates in each of the 4 primary specialty types described above.So,information on charges for 40 doctors (20 foreign and 20 USA medical school graduates) was obtained for each of the 4 specialties.Which of the following tests will be the most appropriate to find out if the primary specialty and the origin of medical school degree interact to affect the charges?

• A)Tukey-Kramer multiple comparisons procedure for one-way ANOVA.
• B)One-way ANOVA F test for differences among more than two means.
• C)One-way ANOVA F test for interaction effect.
• D)Two-way ANOVA F test for interaction effect.