CP

precision capability

USL − LSL

 

 

 

 

 

6 σ

 

CPK

process capability

Min(CPU, CPL)

 

where CPU =

USL − x

CPL =

x − LSL

 

 

3 σ

 

 

3 σ

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 Σx, Σx2, 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.

 

 

 

 

 

 

 

Enter all data

[ DATA ] 5

DEG

STAT

5.

 

 

 

 

 

 

 

[ DATA ] 9

DEG

STAT

9.

 

 

 

 

 

 

 

 

 

 

[ DATA ] 9

DEG

STAT

9.

 

 

 

 

 

 

 

 

 

 

[ DATA ] 9

DEG

STAT

9.

 

 

 

 

 

 

 

 

 

 

[

ENTER

DEG

STAT

0.00

 

 

 

 

 

 

 

]

 

 

 

 

 

 

 

 

 

 

 

DEG

STAT

 

 

 

x = ?

[ x

]

6.13

 

 

 

 

 

n = ?

[ n ]

 

DEG

STAT

8.00

 

 

 

 

 

S = ?

[ S ]

 

DEG

STAT

2.59

 

 

 

 

 

Σx = ?

[ 2ndF] [ Σx ]

DEG

STAT

49.00

 

Σx 2 = ?

[ 2ndF ] [ Σx2]

DEG

STAT

347.00

 

σ= ?

[ 2ndF ] [ σ ]

DEG

STAT

2.42

σ

 

 

 

 

 

[ 2ndF ] [ CP ] 12

DEG

STAT

12. USLCP

CP = ?

[ENTER] 2

DEG

STAT

2. LSLCP

 

 

 

[ENTER]

DEG

STAT

0.69 CP

 

 

 

[ 2ndF ] [ CPK ]

DEG

STAT

12.00 USLCPK

CPK = ?

[ENTER]

DEG

STAT

2.00 LSLCPK

 

 

 

[ENTER]

DEG

STAT

0.57 CPK

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

 

 

DEG ED STAT

dAtA 1

1.5 seconds

→

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, Σx = 59.00, Σx 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

DEG

ED

STAT

2.00

 

 

 

 

[ENTER]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

DEG

ED

STAT

2.00

 

 

 

 

[ENTER].

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 ]

2.Press any key to clear the message. Ex.15: Delete 5 × 5 from the dataset in Ex.9.

1.Press 5 [ × ] 5 [ 2ndF ] [ DEL ]

2.Press any key to clear the message.

DEG

STAT

 

 

dEL

Error

 

 

 

DEG

STAT

0.00

 

 

 

 

 

DEG

STAT

 

 

dEL

Error

 

 

 

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