Question about Texas Instruments TI-30XA Calculator

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I have 55,50, 45, 42 as numbers then I hit the E key then 2nd then the oxn-1 key and get 5.71 is this correct ?

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That is the correct value for the sample standard deviation for this data set. Well, personally I'd round the third digit up to get 5.72.

Posted on Oct 15, 2010

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Dividing a number by Avogadro's number. It is not working. Do I need to change some setting?


Nothing of the sort. Just locate the EE key. You access it by pressing [2nd][x^-1]. It is the one below the [sin] function key.
To enter Avogadro's number
Key in
6.02 [2nd][x^-1] 23 [=/Enter]
If you divide by that number just enclose it between parentheses to ensure correct calculation.
You can also enter it as described 4 lines above, press the = key. The number will be displayed. To divide by it, press the [x^-1] key and its reciprocal will be displayed ready to be multiplied.

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1 Answer

How do i do radicals expressions on a TI 30XA


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2 Answers

How do I find the standard deviation?


Hello,
Here is a detailed exemple. Hope it helps.

76281c5.jpg
Some comments on the various variables (should the information be needed. If not need, please skip it.)

1.All you have to do is follow the instructions key stroke for key stoke, but enter your own data.
2. If a number is repeated 3 times like the number 55, you can enter it 3 times or use the shortcut in the exemple
55 [2nd][FREQ]3 [Sigma+].
3.If you make a mistake and enter the wrong number, use the [Sigma-] key to remove it. That is similar to what a cashier does when an item is entered twice: it is entered a third time but with minus sign.
4. Every time an item is entered, the display shows the total number of items so far. When it is finished the cashier press the key that sums up the prices to get the total. This is the role of the [2nd][Sigma X] key combination.
5. The average number of the data is obtained by the [2nd][x bar] combination. The last two key combinations display the two type of deviations.

Check the theory you have been taught and try again. If that is not the type of statistics you were supposed to do, then give more information.

Oct 28, 2009 | Texas Instruments TI-30XA Calculator

1 Answer

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How do you enter negative numbers on a TI-30X iis calculater?


On the bottom of the calculator near the zero and the enter key it has the symbol (-) that is a negative number symbol

Nov 22, 2008 | Texas Instruments TI-30XA Calculator

1 Answer

Light/Dark Screen


Turn on the TI 83 enter 1234
1. press the <2nd> once; press and hold the <up-arrow> until you get the numbers as dark as you want. If you let up and press the arrow key again you have turned the function off. You must start over by pressing the <2nd> key then the <up-arrow> key and hold.

2. If the numbers are too dark; press <2nd> once and hold the <down-arrow> to get it corrected.

3. If this does not correct the light/dark screen condition you need to buy new batteries!

Hope you can follow my explination.

R. Meidell

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1 Answer

Minutes


Yes. Use the following procedure to enter an angle in degrees-minutes-seconds form:

Enter the number of degrees. Press "2ND" "ANGLE" "1"
Enter the number of minutes. Press "2ND" "ANGLE" "2"
Enter the number of minutes. Press "ALPHA" " (double-quote above the +)

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Apr 02, 2008 | Texas Instruments TI-89 Calculator

2 Answers

Standard deviation


image001.gif Enter the first number, 1.
image001.gif Hit the σ+ (Sigma+) key. ( n=1 will appear in the window)
image001.gif Enter the second number, 1.
image001.gif Hit the σ+ (Sigma+) key. (n=2 will appear in the window)
image001.gif . . . . .
image001.gif Enter the last number, 7.
image001.gif Hit the σ+ (Sigma+) key. (n=7 will appear in the window)
image001.gif Hit 2nd x2 (by hitting the 2nd key you are actually selecting the x-bar written above the key.) This gives you the mean.
image001.gif Hit 2nd sqrt(x). This gives you the sample standard deviation which we will use in class.
image001.gif Make sure you turn your calculator off and on for new data sets.

Jan 24, 2008 | Texas Instruments TI-30XA Calculator

5 Answers

X and Y axis disappeared


If you are using the TI 89 titanium Go to your graph press f1 go do to last option (format) you can turn on your x and y axes there

Oct 31, 2007 | Texas Instruments TI-89 Calculator

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