Problem 2-19

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 physicians' 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 (in 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.

Click on the datafile logo to reference the data.

Without Wait- Tracking System	With Wait- Tracking System
24	31
67	11
17	14
20	18
31	12
44	37
12	9
23	13
16	12
37	15

(a)

What are the mean and median patient wait times for offices with a wait-tracking system?

If required, round your answer to two decimal places.

Mean	=
Median	=

What are the mean and median patient wait times for offices without a wait-tracking system?

If required, round your answer to two decimal places.

Mean	=
Median	=

(b)

What are the variance and standard deviation of patient wait times for offices with a wait-tracking system?

If required, round your answer to two decimal places.

Variance	=
Standard deviation	=

What are the variance and standard deviation of patient wait times for visits to offices without a wait-tracking system?

If required, round your answer to two decimal places.

Variance	=
Standard deviation	=

(c)

Choose the correct box plot for patient wait times for offices with a wait-tracking system.

(i) (ii) Patients wait time Without Wait-Tracking System 35 3.0 w Frequency 25 Value N 20 15 10 20 30 40 60 70 10 Patients wait time Without Wait-Tracking System (iii Patients wait time Without Wait-Tracking System (iv) 70 60 3 50 Frequency N Value 40 30 20 10 15 20 25 30 35 10 Patients wait time Without Wait-Tracking System(i (ii) Patients wait time With Wait-Tracking System 40 35 3 30 Frequency N 25 Value 20 15 10 15 20 25 30 35 10- Patients wait time With Wait-Tracking System (iii) (iv) Patients wait time With Wait-Tracking System 70 60 50 Frequency Value 40 N 30 20 10 20 30 40 50 60 70 Patients wait time With Wait-Tracking System 10