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
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If you divide by that number just enclose it between parentheses to ensure correct calculation.
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2 Answers

How do I find the standard deviation?

Here is a detailed exemple. Hope it helps.

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.

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1 Answer

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

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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.

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