I am trying to calculate standard deviations with this calculator -which means I need it to display an exact answer. I keep getting 1.007 when the answer should be 1.0068. I have tried changing the mode settings around and still I can't get it to come up with the right answers. I need to complete my lab experiment yesterday, can anyone help me??!!

Re: I Cant get the Correct Answers!

If you're sure the answer isn't really 1.007, check to see if the calculator is in fixed mode. You can change it to scientific notation(that'll give you lots of digits past the decimal place, or I prefer engineering, which is scientific except all powers of ten are in multiples of three).

Posted on Oct 05, 2007

Here is one technique I used on the TI84Plus.

Create two lists list1(50) and list2(50) of equal dimension (same length)

You will have to find how to do it on ClassPad.

Fill list2 with zeros

Fill list1 with your data.

Sort the list in ascending order (if it is not sorted)

Do standard deviation calculation on list1 (or calculate the average)

The mean of the data is in a special variable (xbar)

From the command line using the list syntax calculate abs(list1-xbar) and store results in list2, overwiting the zeros.

Perform standard deviation on the new list2. You will get the mean deviation from the mean in the variable xbar.

**A simple request from you**. Can you please not use MINUS as a verb? By doing so you are propagating incorrect usage. There is a short and correct way to express the operation:** to add.**

Create two lists list1(50) and list2(50) of equal dimension (same length)

You will have to find how to do it on ClassPad.

Fill list2 with zeros

Fill list1 with your data.

Sort the list in ascending order (if it is not sorted)

Do standard deviation calculation on list1 (or calculate the average)

The mean of the data is in a special variable (xbar)

From the command line using the list syntax calculate abs(list1-xbar) and store results in list2, overwiting the zeros.

Perform standard deviation on the new list2. You will get the mean deviation from the mean in the variable xbar.

May 05, 2012 | Casio ClassPad 300 Calculator

The normalcdf function takes three arguments: the z value, the mean, and the standard deviation. In the "standard" case the mean is 0 and the standard deviation is 1. Thus, try calculating

normalcdf(-.1923, 0, 1) .

normalcdf(-.1923, 0, 1) .

Jun 29, 2011 | Texas Instruments TI-84 Plus Silver...

Example: Enter the following x variables, and determine the sample and population standard deviations.

**x** = {1,2,3}

- Press [DATA] and begin to enter the data as indicated into the L1, L2 or L3 lists. To input a data point, type the value and press [ENTER]. Press the down arrow key to move on to the next data point.
- Press [2nd], [STAT], and then choose 1-VAR.
- For the "DATA" option, choose the listname the data is stored in (L1, L2 or L3). For the "FRQ" option, choose "ONE" since this data does not include a frequency list.
- Arrow down to "CALC" and press [ENTER].
*Answers should be as follows:*

3:Sx (Sample Standard Deviation) = 1

4:sx (Population Standard Deviation) = 0.816497 - Press [2nd] [MODE] to exit STAT mode.

Oct 20, 2010 | Texas Instruments TI30XS Scientific...

- Calculator must be in SD mode (standard deviation mode) :Press [MODE] [.]
- However, if [FIX] or [SCI] appears on display you must press [MODE][9] first.
- Data input always starts with [SHIFT][SAC], to clear the registers of old data.
- Type a number and press the [DATA] key, it is the [M+] key at the bottom right of keypad.

Press [SHIFT] [9] (sigma n-1) to get sample standard deviation

Press [SHIFT][8] (sigma n] for the population standard deviation

Press [SHIFT] [7] (xbar) for the mean

Press [SHIFT] [6] (n) for the number of data entries

Press [SHIFT] [5] (capital sigma x) for the sum of values

Press [SHIFT] [4] (capital sigma x to y) for the sum of squares of the values

For additional information you might consider taking a look at the calculator manual.

Apr 30, 2010 | Casio FX-260 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:

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.

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:

- Press the [AC] button to exit the data editor.
- Press [****][STAT].
- Press [5:Var] to open the statistical result selection screen.
- Press [3: xSigma_n] or [4:xSigma_n -1] depending on what you are interested in (population or sample) standard deviation.
- 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).
- Press [=] to display the current value of the SD chosen.
- By doing this you are in fact storing it it answer memory.
- 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).
- The calculator will display Ans^2.
- Press [=] to display the value of the variance.

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

M=500 and S=100 in a normal distribution, what percentage of the subjects have scores between 400 and 600

Jun 03, 2009 | Casio Calculators

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 =

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 =

Oct 05, 2008 | Casio FX-115ES Scientific Calculator

Standard deviation is outlined here (as well as everything else)

http://education.ti.com/guidebooks/graphing/84p/TI84PlusGuidebook_Part2_EN.pdf

http://education.ti.com/guidebooks/graphing/84p/TI84PlusGuidebook_Part2_EN.pdf

Jul 16, 2008 | Texas Instruments TI-84 Plus Silver...

Texas Instruments TI-86 Statistics How-To Information
The following instructions should allow you to calculate the mean and standard deviation using a TI-86 calculator.

- Press STAT
- Select EDIT
- Enter data into a list: [2.32 ENTER 2.43 ENTER 2.39 ENTER, etc.] Continue until all data have been entered. (use arrows keys to go to the y value, if any)
- EXIT until you reach the main ("blank") screen. (If you try to calculate while you're in the data menu, it thinks you're still trying to enter data!)
- Press STAT
- Select CALC
- Select OneVa
- Select LIST, NAMES, xStat(F2), Press ENTER
- The calculator provides Max, Min, Mean, Standard Deviation, Sum, Sigma, etc. You will be primarily interested in the Mean and Standard Deviation (sx).

Nov 15, 2007 | Texas Instruments TI-86 Calculator

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

Sep 07, 2006 | Casio FX-7400G Plus Calculator

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