Question

6.6.17    An experiment was conducted to compare two methods for operating a group family medical practice. Four hundred patients were randomly assigned to two groups: one group received the conventional direct contact with physicians, while the other group made first contact with a nurse-practitioner and were then referred to a physician if a physician's services were deemed necessary. At the conclusion of the experiment, the quality of each person's medical care was rated as satisfactory by an impartial medical observer in consultation with the patient. The results of the experiment are shown in the table. Do the data present sufficient evidence to indicate a difference in the proportions of satisfactory ratings for the two methods of patient care? Test using a=0.05.

                                                                                             Results

First Contact                                  Satisfactory                     Unsatisfactory                      Totals

Conventional                                            146                                    54                              200

Nurse Practitioner                                    159                                    41                              200

Answer 1

as test statistic does not fall in rejection region; we can not reject null hypothesis

we do not have evidence at 0.05 level to conclude that proportion of satisfactory ratings are different for two methods,