Patients recovering from an appendix operation normally spend an average of 6.3 days in the hospital. The distribution of recovery times is normal with a = 2.0 days. The hospital is trying a new recovery program designed to lessen the time patients spend in the hospital. The first 16 appendix patients in this new program were released from the hospital in an average of 5.8 days. On the basis of these data, can the hospital conclude that the new program has a significant reduction of recovery time. Test at the .05 level of significance.

Calculate the 95% confidence interval.

Steps: Q11: The mean you will use for this calculation is

A. 5.8

B. 6.3

Q12: What is the new critical value you will use for this calculation?

Q13: As you know, two values will be required to complete the following equation: __________ less than or equal to (the mean) less than or equal to __________

* I am having a hard time with this problem. Someone please explain, thank you!!