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January 24

z scores on a ti 84 plus

what are some ways to find z scores on a tI 84 plus calculator?Accdude92 (talk) 16:00, 24 January 2011 (UTC)[reply]

Could you please give some more explanation, and Wikify wherever possible. I'm not sure I understand your question. Thanks. — Fly by Night (talk) 21:07, 24 January 2011 (UTC)[reply]

We have a redirect z score; obviously calculating it from the datum, mean, and standard deviation is trivial. I imagine the question is "How do I evaluate the normal CDF on a TI-84 Plus?", which just means evaluating the error function. The manual for that series doesn't say it provides the error function, but you can try it (e.g., erf(1)); otherwise, you can use one of the numerical approximations given in the article, or perhaps the interactive "Z test" that the calculator provides is usable for this. --Tardis (talk) 00:35, 25 January 2011 (UTC)[reply]

Looking for a math word

In mathematics, what is a word that is the opposite of a sample. It should be another word than population, because population implies living things and I am talking about events. 24.92.70.160 (talk) 17:23, 24 January 2011 (UTC)[reply]

It looks like you are referring to statistics. If so, population is what you want. It does not imply living things. -- kainaw ™ 17:35, 24 January 2011 (UTC)[reply]

I should have been more clear. I am referring to statistics, but I need the word for a paper about humanities, and to the common person not trained in statistics population does imply living things. The context I need it for is: This action should be viewed as a sample, and not as a _____. Although most people would understand the use of sample here they would probably be confused by the use of the word population in the blank. 24.92.70.160 (talk) 17:53, 24 January 2011 (UTC)[reply]

Just state what it is a sample/population of: This is a sample of events, not a complete population of all events. -- kainaw ™ 18:13, 24 January 2011 (UTC)[reply]

Sometimes "universe" is used. Bubba73 ^{You talkin' to me?} 19:39, 24 January 2011 (UTC)[reply]

When I hear "population", it is a "closed set". When I hear "universe", it is an "open set". Of course, that requires defining open and closed sets. In my field of work, a closed set is a set where each member is known - so you could count them all up if you wanted to. An open set is a set in which members meet a description, but it is not known how many there are. Given an item, you can tell if it is a member or not, but you don't know every possible member. An example could be: The set of all 3-digit integers containing a 2. The size of the population is easy to calculate. The set of all integers with containing a 2. The size is infinite, but identifying membership is easy. So, the first is a population. The second is a universe. Of course, if you switch to a different field you will get entirely new definitions for all of this. -- kainaw ™ 19:45, 24 January 2011 (UTC)[reply]

If you're looking for a layman's term, how about "totality"? If that's close but not quite the word you want, see if you can find the right word in a thesaurus. —Bkell (talk) 20:32, 24 January 2011 (UTC)[reply]

In Euclidean_Geometry#Axioms the common notion no 5 is that the whole is greater than the part. So we may use the word whole for population and part for sample. Bo Jacoby (talk) 20:37, 26 January 2011 (UTC).[reply]