CP precision
capability
σ
6
LSL
USL
−
CPK
process capability Min(CPU, CPL)
where CPU =
σ
3
x
USL
−
CPL =
σ
3
LSL
x
−
Note: In statistics mode, all function keys are available except those
used for base-n calculations.
Ex. 9: Enter the following data {2, 5, 5, 5, 5, 9, 9, and 9} and
calculate
Σ
x,
Σ
x
2
, n, x , S, CP, and CPK, where USL value =
12 and LSL value = 2.
In STAT mode
[ 2ndF ] [ STAT ]
DEG STAT
0.00
[ DATA ] 2
DEG STAT
2.
[ DATA ] 5
DEG STAT
5.
[ DATA ] 5
DEG STAT
5.
[ DATA ] 5
DEG STAT
5.
[ DATA ] 5
DEG STAT
5.
[ DATA ] 9
DEG STAT
9.
[ DATA ] 9
DEG STAT
9.
[ DATA ] 9
DEG STAT
9.
Enter all data
[
ENTER
]
DEG STAT
0.00
x = ?
[ x ]
DEG STAT
6.13
n = ?
[ n ]
DEG STAT
8.00
S = ?
[ S ]
DEG STAT
2.59
Σ
x = ?
[ 2ndF] [
Σ
x ]
DEG STAT
49.00
Σ
x
2
= ?
[ 2ndF ] [
Σ
x
2
]
DEG STAT
347.00
σ
= ?
[ 2ndF ] [
σ
]
DEG STAT
2.42
σ
CP
[ 2ndF ] [ CP ] 12
DEG STAT
12.
USL
CP
[
ENTER
] 2
DEG STAT
2.
LSL
CP
CP = ?
[
ENTER
]
DEG STAT
0.69
CPK
[ 2ndF ] [ CPK ]
DEG STAT
12.00
USL
CPK
[
ENTER
]
DEG STAT
2.00
LSL
CPK
CPK = ?
[
ENTER
]
DEG STAT
0.57
Note: The calculator retains the data you have entered until you exit
statistics mode. The data is retained even if you turn off the
calculator or it automatically turns off.
Viewing Statistics Data
Press [ DATA ] or [
ENTER
] in edit (ED) mode to view the statistics data
you have entered. (If you press [ DATA ] the item number of the data
appears briefly before the value.)
Ex.10: View the data entered in Ex. 9.
Method 1
1. Press [ 2ndF ] [ EDIT ] to enter edit mode.
2. Press [ DATA ] once to view the first data item.
DEG ED STAT
dAtA 1
1.5 seconds
→
DEG ED STAT
2.00
3. Continue pressing [ DATA ] to display each data item. You will
see data 2, 5.00, data 3, 5.00, data 4, 5.00, data 5, 5.00, data 6,
9.00, data 7, 9.00, data 8, 9.00 in sequence.
Method 2
1. Press
[
ENTER
] once to view the first data item.
DEG ED STAT
2.00
2. Continue pressing [
ENTER
] to display each data item. You will see
5.00, 5.00, 5.00, 5.00, 9.00, 9.00, 9.00 in sequence.
Adding a Data Item
Ex. 11: To add a 9th data item, of value 10, to the Ex. 9 dataset:
1. Press [ DATA ] 10
DEG ED STAT
10.
The calculator updates the statistics as you enter data. You can then
recall the statistics to get : x = 6.56, n = 9.00, S = 2.74,
Σ
x = 59.00,
Σ
x
2
= 447.00 and
σ
= 2.59.
Editing Statistics Data
Ex.12: Change the value of data item 1 in Ex. 9 from 2 to 3.
Method 1
1. Press 2 [ 2ndF ] [ DEL ] 3
Method 2
1. Press [ 2ndF ] [ EDIT ]
DEG ED STAT
0.00
2. Display 2 by pressing [ DATA ] or
[
ENTER
]
DEG ED STAT
2.00
3. Enter 3 to overwrite 2.
DEG ED STAT
3.
4. Press
[
ENTER
] to make the change.
5. Press [ 2ndF ] [ EDIT ] to exit edit mode.
Ex.13: Based on Ex.9, delete the first data entry (of value 2).
Method 1
1. Press 2 [ 2ndF ] [ DEL ] to delete 2.
Method 2
1. Press [ 2ndF ] [ EDIT ]
DEG ED STAT
0.00
2. Display 2 by pressing [ DATA ] or
[
ENTER
].
DEG ED STAT
2.00
3. Press [ 2ndF ] [ DEL ]
DEG ED STAT
5.00
4. Press [ 2ndF ] [ EDIT ] to exit edit mode.
Delete Error
If you try to delete a value that is not in the dataset,
dEL Error
appears. (Existing data is not affected.)
Ex.14: Delete 7 from the dataset in Ex.9.
1. Press 7 [ 2ndF ] [ DEL ]
DEG STAT
dEL Error
2. Press any key to clear the message.
DEG STAT
0.00
Ex.15: Delete 5 × 5 from the dataset in Ex.9.
1. Press 5 [ × ] 5 [ 2ndF ] [ DEL ]
DEG STAT
dEL Error
2. Press any key to clear the message.
DEG STAT
0.00
Weighted Data Entry Method
Instead of entering each data item individually, you can enter the
value and the number of occurrences of that value (up to 255). The
data from Ex.9 can be entered as follows:
Value
Number of occurrences
Alternative method
2 1
[ DATA ] 2
5 4
[ DATA ] 5 [ × ] 4
9 3
[ DATA ] 9 [ × ] 3
where item 1 = 2, items 2 to 5 = 5, and items 6 to 8 = 9.
Error Conditions
The indicator
FULL
appears when any of the following conditions
occur. Further data entry is not possible. Press any key to clear the
indicator. Providing that you remain in statistics mode, previously
entered data entries are unaffected.
•
You attempt to enter more than 80 data items.
•
The number of occurrences of of any particular data value is
greater than 255
•
The product of the number of data items and the number of
occurrences is greater than 20400.
© Copyright 2002 Hewlett-Packard Development Company, L.P.
Reproduction, adaptation or translation without prior written approval
is forbidden except as allowed under copyright laws.
Printed in China.
HDPMR178E23 MWB
HP part number: F2212-90001
