How do I get the variance on the calc. - Texas Instruments TI-30XA Calculator

Well what I really wanted to know the most is if it pops up while you\'re not even touching your mouse or keyboard...

If you changed your .exe to .com like I said and it came back, then it\'s normal... ... Just delete the calc.com file. Don\'t worry, calc.exe came back on its own so the calc.com we made is now useless. That\'s why you can now delete calc.com. It\'s also just to reset what was in your old calc.exe, in case it has a keyboard shortcut and other hidden stuff integrated.

Still gotta make sure though... Can you right-click on calc.exe and choose "Properties" to see if there\'s any keyboard shortcut? The field (shortcut key) should be left blank in case there\'s something in there. Or to "None".



IF the calc.exe still pops up while you\'re not doing anything, then it\'s time for some hijackthis.

Get it here:

http://www.download.com/Trend-Micro-Hijack...4-10227353.html

Do a system scan and save a logfile.

After the scan is over, copy all what\'s in the list (notepad), and post it here.

Let\'s take a look at what\'s running.

To calculate this you press ALPHA (the green key) and 5 or 6 depending on if you want sample variance (ALPHA 5) and for population variance (ALPHA 6).

Follow the instructions from service provider.

This shows you how to enter your data and calculate some statistical values. Keep in mind that the variance is the square of the standard deviation.


In the main menu select [STAT] icon to enter Stat mode and display the statistical data lists. Use the statistical data lists to input data and perform statistical calculations. Use the arrows to move the highlighting around the lists.
Example: Enter the following values in List 1
1st line enter 90 [EXE]
2nd line 85 [EXE]
3 79 [EXE]
4 75 [EXE]
5 70 [EXE]
6 68 [EXE]
7 56 [EXE]

When finished you press [F2:Calc], then [F1:1Var] and the statistical results appear on screen.

Title of screen : 1-Variable
x bar =74.7142857
Capital Sigma x= 523
Capita Sigma X squared = 39851
x lower case sigma n = 10.5249945
x lower case sigma n-1= 11.3682934
n = 7
Scroll down with Down arrow to access other data
minX =56
Q1=68
Med =75
Q3=85
Xbar -x lower case sigma n =64.1892911
x bar x lower case sigma n = 85.2392802
maxX=90
Mod=90

All you have to do now, is to look at the theory you learned and interpret what these values mean.

Part A shows you how to enter your data and calculate some statistical values. Keep in mind that the variance is the square of the standard deviation.

You can safely ignore the PART about REGRESSIONs until that time you need the information.

PART A
In the main menu select [STAT] icon to enter Stat mode and display the statistical data lists. Use the satistical data lists to input data and perform statistical calculations. Use the arrows to move the highlighting around the lists.
Exemple: Enter the following values in List 1
1st line enter 90 [EXE]
2nd line 85 [EXE]
3 79 [EXE]
4 75 [EXE]
5 70 [EXE]
6 68 [EXE]
7 56 [EXE]

When finished you press [F2:Calc], then [F1:1Var] and the statistical results appear on screen.
Title of screen : 1-Variable
x bar =74.7142857
Capital Sigma x= 523
Capita Sigma X squared = 39851
x lower case sigma n = 10.5249945
x lower case sigma n-1= 11.3682934
n = 7
Scroll down with Down arrow to access other data
minX =56
Q1=68
Med =75
Q3=85
Xbar -x lower case sigma n =64.1892911
x bar + x lower case sigma n = 85.2392802
maxX=90
Mod=90

All you have to do now, is to look at the theory you learned and interpret what these values mean.


PART B

1. Once you enter your data [MENU][STAT],
2. press [F1:Graph],
3. select Gph1, Gph2, or Gph3.
4. Once the graph of the experimental data is drawn, you will have access to the diverse regression models.
5. Your choices are
   

• [X:Linear]
  
• [Med-Med],
  
• [Quadratic :X^2]
  
• [Cubic;X^3]
  
• [Quartic: X^2].
  
• Press [F6] to scroll right to access the others:
  
• [Logarithmic:LOG],
  
• [Exponential :EXP],
  
• [Power :Pwr] and
  
• [Sinusoidal:Sin]

1. After you select a model and press [EXE], the screen displays the equation and its various coefficients.
2. On that same screen, you have a menu option [F6:Draw].
3. If you select it, the regression curve will be drawn on the same screen as your statistical graph.
4. This allows you to judge if the fit is good. If it is not, you have the option to choose another model.
5. The other option [F5:Copy] allows you to save the regression equation in the Y1, Y2, etc. variables.

Calc - Java Calculator for cell-phones and MIDP devices

• Scientific
• Statistical
• Financial
• Programmable
• Graphing
• Complex arithmetic
• Matrix/vector arithmetic
• Unit arithmetic
• RPN

Download You can download Calc into your phone or MIDP device using one of these links:
Calculator 1
http://midp-calc.sf.net/Calc.jad, or
http://midp-calc.sf.net/Calc.jar

click her for calculator 2

transfer both the files to your mobile and then install them by just clicking on open install

the best thing to do here is to separate the steps for calculating the variance into different functions. To compute the variance the first thing to do is to compute the mean or the average of the numbers in the array. so your first function will loop through each of the numbers and divide it by the length of your array. the output is the returned. The next thing to do is create another function for the variance. loop through each of the numbers again and subtract to each number the mean. square the value then add to the previous. so that means you have another variable that starts from zero and just adds the answer. after that divide it by the length of the array again and what you are going to get is the value for the variance.

standard deviation

calculate mean of a data set:

1. Turn calc. on or press MODE SeTUP
2.Press 3 for STAT
3. Press 1 for VAR
4.Enter values for X column
5. WHen done entering press SHIFT 1
6.Press 5
7.Press 2 to calculate the mean
8.Press =

Get instruction booklet which gives key strokes and examples on pages 10-11

http://education.ti.com/educationportal/downloadcenter/SoftwareList.do?website=US&tabId=2&paneId=18#27

This calc will do standard deviations. In the manual it is on page 2 and also on page 40.