Question

1. Doctors obtained the data below on the number of recovery days in the hospital using the new and old appendix surgery procedures. Using the new and old surgery procedures, do the data provide sufficient evidence to conclude that the mean number of recovery days in the hospital is smaller with the new surgery procedure than with the old procedure? Use the appropriate statistical test to determine if the using new surgery procedure results in a smaller mean number of recovery days. All appropriate statistical procedures/tests should be done with 5% P-value or 95% Confidence Interval.

New appendix surgery procedure	8	9	6	10	7	8	7	8	7	6	6	6	7	9
Old appendix surgery procedure	5	6	17	15	9	9

Click here for the Appendix_surgery-PA#1 data. (3 points)

• a. P-value = 0.0113. We are 95% confident that the data provide sufficient evidence to conclude that the mean number of recovery days in the hospital is smaller with the new appendix surgery procedure than with the old procedure.
• b. P-value = 0.025. We are 95% confident that the data provide sufficient evidence to conclude that the mean number of recovery days in the hospital is smaller with the new appendix surgery procedure than with the old procedure.
• c. P-value = 0.113. The test is inconclusive and we cannot conclude that the mean number of recovery days in the hospital is smaller with the new appendix surgery procedure than with the old procedure.
• d. P-value = 0.227. The test is inconclusive and we cannot conclude that the mean number of recovery days in the hospital is smaller with the new appendix surgery procedure than with the old procedure.
• e. None of the choices.

Answer 1

P-value = 0.113. The test is inconclusive and we cannot conclude that the mean number of recovery days in the hospital is smaller with the new appendix surgery procedure than with the old procedure.