Problem 2-21

Suppose that the average waiting time for a patient at a physician's office is just over 29 minutes. In order to address the issue of long patient wait times, some physician's offices are using wait-tracking systems to notify patients of expected wait times. Patients can adjust their arrival times based on this information and spend less time in waiting rooms. The following data show wait times (minutes) for a sample of patients at offices that do not have a wait-tracking system and wait times for a sample of patients at offices with a wait-tracking system.

Without Wait- Tracking System	With Wait-Tracking System
20	8
56	12
12	11
35	16
26	32
48	36
16	8
10	9
27	15
36	5

(a)	Considering only offices without a wait tracking system, what is the z-score for the tenth patient in the sample (wait time = 36 minutes)?
	If required, round your intermediate calculations and final answer to two decimal places.
	z-score =
(b)	Considering only offices with a wait tracking system, what is the z-score for the sixth patient in the sample (wait time = 36 minutes)?
	If required, round your intermediate calculations and final answer to two decimal places.
	z-score =
	How does this z-score compare with the z-score you calculated for part (a)?
	The input in the box below will not be graded, but may be reviewed and considered by your instructor.
	Z score of part b is greater than part a
(c)	Based on z-scores, do the data for offices without a wait tracking system contain any outliers?
YES or NO

	Based on z-scores, do the data for offices with a wait tracking system contain any outliers? YES or NO