Re: Standard Normal Distribution

In article
<18afafc0-5b54-4c7c-a47c-05beb0867c63@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Gurveer <gurveer.sra@xxxxxxxxx> wrote:

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

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
.

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