Need help calculating Ppk

question:

Your team decided to use a Pp Ppk study. Reflected in the data below is last month's wait times. You need to use this data in your Pp Ppk study. Remember, you also needed to address that out-of-control point on that XmR Chart (point #27) found in the last deliverable. The team had an assignable-cause for that point, but since that adjustment, a subsequent control chart study determined that the process was now in control. And, you know that the process needs to be in control PRIOR to using a Pp Ppk study. You also need to construct a histogram as a part of your capability study to ensure that the process variation is still acting normal.

Data:	Wait times
2
11
9
8
6
12
9
9
8
13
11
7
7
10
14
4
8
10
9
9
15
9
9
6
10
9
7
9
8
5
Upper spec is 30 minutes Lower spec/target is 0 minutes

Project:	Healthcare Project
Deliverable:	Pp Ppk
Student last name:
Pp:			1.818
Ppk::::	Not accurate ->	1.062
Random?:::		yes
Acceptable? :::		yes

Pp is accurate, Ppk is not. Ppk is somewhere between 2 and 3