Question about Casio FX-115ES Scientific Calculator

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How do you calculate sample variance... - Casio FX-115ES Scientific Calculator

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  • Anonymous Mar 14, 2014

    what is the actual yield if you are given 0.3305g of the sample?

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Sample variance on Sharp EL-738


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).

Jul 17, 2012 | Sharp EL-738 Scientific Calculator

2 Answers

Calculate Variance on Casio FX-83ES Calculator


Hello,
I am happy that you found my solution helpful and even flattered that you copied it in this thread. By doing this, you gave me the opportunity to discover an error in my post. In fact, the calculator does provide a column for the frequency. If you enter nothing in the frequency column, all data items will have their frequency set to 1, by default.

Back to the current subject: How to get the variance (the square of the standard deviation).
When you finish entering your data:
  1. Press the [AC] button to exit the data editor.
  2. Press [****][STAT].
  3. Press [5:Var] to open the statistical result selection screen.
  4. Press [3: xSigma_n] or [4:xSigma_n -1] depending on what you are interested in (population or sample) standard deviation.
  5. The screen echoes the symbol for the value selected (the value displayed on the bottom line may be 0 or an old value from a previous calculation: it is not the value you have just calculated).
  6. Press [=] to display the current value of the SD chosen.
  7. By doing this you are in fact storing it it answer memory.
  8. All you have to do now is to raise it to power 2 by pressing the [x^2] key ( the one above the [HYP] key).
  9. The calculator will display Ans^2.
  10. Press [=] to display the value of the variance.
If you are not interested in the value of the standard deviation, but just want the variance, follow the foregoing procedure until step #5.
While the symbol xSigma_n or xSigma_n-1 is still displayed with the blinking cursor to its right, press the [x^2] key above the [HYP] key. The screen displays say xSigma_n ^2. Press [=] to calculate the variance.

As my motto says, I am always happy to help, but happier still when people show true appreciation.

Hope it helps.

Dec 11, 2009 | Casio fx-300ES Calculator

1 Answer

How do i find the variance if i'm given the x


Hello,
Set the [Mode] to [3:STAT]. You are offered the choices
1:1-Var
2:A+BX
3:__+cX^2
etc.
If you want to do 1-Var statistics, you press 1:1-Var. A column template opens where you put the X values. If a value is repeated you enter it several times. (there is no frequency column.)
When you enter all data you press [SHIFT][STAT]

You have several choices among them
4: SUM to get SigmaX^2 and Sigma X
5: VAR to get n, the mean X bar, the sample and population standard deviations
6:MINIMAX to get MinX and MaxX
7: Distr the Distributions.

If you want to perform 2-Var statistics
You press [MODE][STAT] and select one of the Regression models
2:A+BX
3:__+cX^2
etc.
The selection of any of the 7 regression models, opens a two-column template where you enter the X and Y values
When finished press [SHIFT][STAT]
The choices offered are
  1. Type takes you back to select type of statistics to perform
  2. Data To edit the data in the columns
  3. Edit To insert or delete a value
  4. SUM To access the calculated values of SigX^2,SigX,SigY^2,SigY,SigXY,SigX^3, SigX^2Y, SigX^4
  5. Var : To access the calculated values n, Xbar, Sample STD for x, S STD for Y, Pop STD for X, and Pop STD for Y
  6. MinMax : MinX, MinY, MaxX, MaxY
  7. Reg: Gives you the regression coefficients for the particular regression model you want to test.
The mean is represented by X bar.
The variance is the SQUARE of the Standard Deviation.
Hope it helps.

Nov 06, 2009 | Casio fx-300ES Calculator

2 Answers

Mean (x-bar), variance (s^2) and standard deviation (s)


Enter 1 then press the (SIGMA)+ button (SIGMA) looks like a sideways capital M ....its a Greek letter.

Then enter 2 and press the (SIGMA)+ button
Then enter the next value and press the (SIGMA)+ button

After you press the (SIGMA)+ button the calculator displays the number of numbers you have entered

Once all numbers of your sample have been entered press 2nd and the button corresponding to x-bar

sample st. dev is the (sigma)n-1 button (need to use 2nd button)
variance is (std. dev.)^2

population st. dev is the (sigma)n-1 button (need to use 2nd button)
variance is (std. dev.)^2

Jan 18, 2008 | Texas Instruments TI-30XA Calculator

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