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Jul 27, 2009, 12:36:41 AM7/27/09

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Hi

I read many threads on this group related to calculating the normal

distribution but I couldn't find what I needed exactly. Is there any

way in the HP 50g to calculate the value of standard normal

distribution(area under the curve) using(given) just the z-values? For

eg:- Using the tables, 0.4772 is the value of standard normal

distribution for a z-value of 2.0 regardless of what the mean,

standard deviation or the data values were although I know that z-

value is calculated using these parameters.

Thank you.

Regards,

Gurveer

Jul 27, 2009, 1:08:50 AM7/27/09

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In article

<18afafc0-5b54-4c7c...@l35g2000pra.googlegroups.com>,

Gurveer <gurve...@gmail.com> wrote:

<18afafc0-5b54-4c7c...@l35g2000pra.googlegroups.com>,

Gurveer <gurve...@gmail.com> wrote:

Are you familiar with the UTPN command?

If you put 0, 1 and z on the stack, in that order, then the UPTN command

returns the upper tail probability.

This will give you 0.5 minus your value of 0.4772, when rounded to 4

decimal places).

The 0 and 1 are for the mean and standard deviation, which are 0 and 1,

respectively, for the z distribution.

You can create a program to get your value directly from the z-score.

For example:

\<< 0. 1. ROT UTPN NEG .5 + \>>

will take a positive value on the stack as the z-score and return the

probability of a score being between 0 and that z-score.

--

Virgil

Jul 27, 2009, 1:39:53 AM7/27/09

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On Jul 26, 11:08 pm, Virgil <virg...@nowhere.com> wrote:

> In article

> <18afafc0-5b54-4c7c-a47c-05beb0867...@l35g2000pra.googlegroups.com>,

> In article

> <18afafc0-5b54-4c7c-a47c-05beb0867...@l35g2000pra.googlegroups.com>,

Thanks a lot Virgil. That's exactly what I wanted. Yeah, I'm somewhat

familiar with the command UTPN and the concept you told makes sense.

That's all I need and that simple program just works awesome for me.

Thank you once again.

Regards,

Gurveer

Dec 2, 2021, 3:02:15 AM12/2/21

to

> > If you put 0, 1 and z on the stack, in that order, then the UPTN command

> > returns the upper tail probability.

> >

> > This will give you 0.5 minus your value of 0.4772, when rounded to 4

> > decimal places).

> >

> > The 0 and 1 are for the mean and standard deviation, which are 0 and 1,

> > respectively, for the z distribution.

For anyone else finding this old post via Google search, the second argument (1 here) is in general NOT the standard deviation, but rather the variance (square of the standard deviation). In this example the variance is also 1, of course.
> > returns the upper tail probability.

> >

> > This will give you 0.5 minus your value of 0.4772, when rounded to 4

> > decimal places).

> >

> > The 0 and 1 are for the mean and standard deviation, which are 0 and 1,

> > respectively, for the z distribution.

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