HP 9g Graphing manual Correcting Statistical Data, Probability Distribution 1-Var Data

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Cpx or Cpy Potential capability precision of the x values or y values,

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Cpkx or Cpky Minimum (CPU, CPL) of the x values or y values, where CPU is the upper spec. limit of capability precision and CPL is lower spec. limit of capability precision.

Cpkx = Min (CPUX, CPLX) = Cpx(1–Cax) Cpky = Min (CPUY, CPLY) = Cpy(1–Cay)

ppm Parts per million, Defection Per Million Opportunities.

Note: When calculating process capability in 2-VAR mode, the x n and y n values are independent of each other.

Correcting Statistical Data

See Example 45.

1.Press [ DATA ].

2.To change the data, select DATA-INPUT. To change the upper or lower spec. limit, select LIMIT. To change ax, select DISTR.

3.Press [ ] to scroll through the data until the entry you want to change is displayed.

4.Enter the new data. The new data you enter overwrites the old entry.

5.Press [ ] or [] to save the change.

Note: The statistical data you enter is retained when you exit statistics mode. To clear the data, select D-CL mode.

Probability Distribution (1-Var Data)

See Example 46.

1.Press [ DATA ] , select DISTR and press [].

2.Enter a a x value, then press [].

3.Press [ 2nd ] [ STATVAR ].

4.Press [ ] or [ ] to scroll through the statistical results until you find the probability distribution variables you want (see table below).

Variable Meaning

tTest value

P(t)	The cumulative fraction of the standard normal
	distribution that is less than t.

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