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Message |
atingd
Joined: 28 Oct 2007
Posts: 1
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 Posted: October 28, 2007 7:08 PM Post subject: Calculating means/L1-stats |
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Hi!
I have tried looking through this forum but I can't find out how to find means (sd/var/etc).
I know how to get them if I am entering a list of numbers, but I don't know how to enter the data, if I had frequencies.
For example,
If i had a string of numbers, and I had to get their info, I would get into the Stats/List Editor, press [F4] and get into the 1-Var Stats menu, then enter the numbers into the "list" box i.e. {1,2,3,4,5}, then just press [enter] to get the stats.
Instead of using this method, how can I just type the list of numbers into the calculator's "list table"? and what would I type in the "1-Var Stats" menu to get the stats?
And also, how would I enter frequencies into this?
Hope you understand me,
Thanks  .
*Note: In my old ti-83+, I would just enter the Midpoint into List1, and the Frequencies into List2, and then get 1-Var Stat and enter "L1 , L2".
Like so,
I would like to know how to do that in the Ti-89t calculator.
Thanks!
Daniel.
Edit:
Through trial and error, I have managed to do it through the interface,
I did
<1-Var Stats>
List: {150,130,120,110,100,90}
Freq: {2,4,6,10,8,10}
Category List: blank
Include Categories: {}
I managed to get what I wanted, however I would like to know how I would do it by just entering the data into the Lists on the previous page (in the calculator like:
List1 | List2
150 | 2
130 | 4
120 | 6
etc etc.
And what command would I use to get the 1-Var Stats.
Thanks in advance  |
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mellamokb
Joined: 10 May 2007
Posts: 100
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| Posted: November 5, 2007 5:39 PM Post subject: |
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Hi atingd,
Welcome to TI-89.org forums!
You can access most of the calculations on the home screen. If you want to see what functions are available for statistics, simply press [2nd]+[5] to get the math menu, press [6] for statistics, and search the list to see if there is anything you can use. The first function available is OneVar, which is synonymous with 1-Var Stat on the TI-83+. You can use the list editor to create lists and then call OneVar List1, List2 from the homescreen to generate the statistics. However, on both the TI-83 and TI-89, you can create lists on the home screen as well:
| Code: |
{150,130,120,110,100,90}->L1
{2,4,6,10,8,10}->L2
OneVar L1,L2
ShowStat
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The curly braces are found with [2nd]+[(] and [2nd]+[)]. The "->" represents the store key (above [ON]). The rest of the commands can be typed into the calculator or selected from the Math>Statistics menu.
There are functions available for the mean, standard deviation, variance, etc. on the calculator and can be found through Math>Statistics, the catalog, or just typed on the home screen besides using the stats/list editor:
| Code: |
mean({1,2,3,4,5})
3
stdDev({1,2,3,4,5})
sqrt(10)/2
variance({1,2,3,4,5})
5/2
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On the TI-89, you can name lists using any valid variable name (1 - 8 characters, using letters/numbers/underscore and beginning with either underscore or a letter).
Hope this helps!
~ mellamokb |
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