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HP Prime - Statistics
08-22-2014, 01:19 PM
Post: #4
RE: HP Prime - Statistics
To clarify for Walter whose answer was about as useless as any i have ever seen as it did not answer the question. I will rephrase the question to better explain what i need help with.

I have a new calculator that I am trying to learn to use. It is an HP Prime. The manual sucks and makes it hard to find anything of use, and on calculator documentation is a joke. In the manual, if i don't already know the name of a function, good luck finding it.

Current Situation:
I have to use this calculator on a test of which statistics is a very small portion of the material covered. The test has limited time, and I am trying to figure out how to use the Prime to answer certain questions QUICKLY.

I forgot to mention that I was referring to a Normal Distribution but my understanding was that Z-Scores are also sometimes referred to as standard scores and are always part of a normal distribution (not sure this is correct, but that is why i didn't spell out that it was a normal distribution)

So, how do i calculate the area under the curve (yes, the normal distribution curve) between two values of Z. Yes, if i had a definition of the function f(x) = ?? then I could try to integrate, but my memory tells me that was a very time consuming and difficult option and leads to nothing useful for this task. Yes, I could look up values in a table, but no table will be provided. Yes, I could memorize certain values like .683 being between +- std. deviation and estimate, but that is pointless. So what am i left with? Oh, using the calculator to calculate it.....silly me, why didn't I think of that?

There is a function in the HPPrime called normald_cdf(mean, std dev, value) which calculates the area under the curve to the left of the value specified. So, back to my original question, is there a faster/better way to calculate the area between two values for this distribution?

I could do normald_cdf(mean, std dev, upper_value) - normald_cdf(mean, std dev, lower_value)
but that takes forever to enter, so without asking for more condescending, useless answers, is there a way to use the HP Prime to do this faster?

For reference, on the TI calculators a function exists that takes an additional argument so i can specify the upper and lower bound of the region i want to calculate the area for, i am looking for something like this in the Prime.

Thanks in advance.

PS - this test has nothing to do with my company, but thanks for assuming.
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Messages In This Thread
RE: HP Prime - Statistics - walter b - 08-22-2014, 05:42 AM
RE: HP Prime - Statistics - walter b - 08-22-2014, 05:52 AM
RE: HP Prime - Statistics - - 08-22-2014 01:19 PM
RE: HP Prime - Statistics - David Hayden - 08-22-2014, 08:26 PM
RE: HP Prime - Statistics - Tim Wessman - 08-22-2014, 03:39 PM
RE: HP Prime - Statistics - Bill Zimmerly - 08-23-2014, 05:27 AM
RE: HP Prime - Statistics - aurelio - 08-23-2014, 02:48 PM
RE: HP Prime - Statistics - Angus - 08-23-2014, 09:39 AM
RE: HP Prime - Statistics - CR Haeger - 08-23-2014, 10:34 AM
RE: HP Prime - Statistics - parisse - 08-23-2014, 12:04 PM
RE: HP Prime - Statistics - parisse - 08-23-2014, 02:45 PM
RE: HP Prime - Statistics - StephanP - 04-27-2015, 02:37 PM

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