[nabs-l] Requesting help on Statistics - Looking for an AccessibleTable of Standard Normal Probabilities

[Arielle Silverman]

OK-actually in Excel it is easy to look up the probability of a given
Z-score, which is what you would be looking up in the standard normal
table. Simply type into a blank cell:
=normsdist(z)
where Z is the Z-statistic. I think that is what you will usually be
asked to do.
If you need to go the other way (i.e. you have a probability and you
need to know what Z-score lies at that probability), use the following
Excel formula:
=normsinv(p)
where p is the probability you are given. For example, =normsinv(.05)
gives you the Z-score with a probability of .05.
If your calculations are like these you can just use the above Excel
formulas instead of looking things up in the table. If your assignment
is different or more complicated than this, feel free to write me
off-list.
Best,
Arielle

On 11/7/14, Arielle Silverman <arielle71 at gmail.com> wrote:
> Yes, there are some websites where you can enter a number and learn
> its probability, or vice versa. One of these is
> www.graphpad.com/quickcalcs
> The table of standard normal probabilities is equivalent to a
> Z-statistic table. So in GraphPad, you can go to the third radio
> button, "distributions and p-values". Then, depending on your
> assignment, you can either go to "obtain p-value of an f, t or
> z-statistic" or "obtain z, t, or f from a probability".
> If you want to send me your assigned problem off-list, I can tell you
> exactly how to navigate through the GraphPad site to get the table
> values you need:
> arielle71 at gmail.com
> There are also ways to get this information in Microsoft Excel. I can
> look up the formula and send it to you off-list if you are unable to
> find the information you need on a website.
> Best,
> Arielle
>
> On 11/7/14, Roanna Bacchus via nabs-l <nabs-l at nfbnet.org> wrote:
>> Hi Miso you can ask your Disability Services office to braille it
>> for you.  They should be able to get a copy of the table from
>> your prfessor.
>>
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