Question about Casio FX-7400G Plus Calculator

Standard Deviations In my biology lab class we're required to have a calculator that can automatically calculate standard deviation, to save time on the math parts of the labs. Can I do that on this calculator? I couldn't find anything about how to calculate it in the manual.

hoganm4 Sep 23, 2008

what is the standard deviation for the set of numbers; 2.44,2.50,2.53,2.76,2.84,2.90,2.93,2.93,3.72,4.20,4.80

2 Answers

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374 Answers

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

Posted on Jul 17, 2007

Anonymous

Standard deviation is a longer process then that, you have to work out the mean of these numbers, then the variance, then the standard deviation.

Posted on Oct 24, 2008

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Related Questions:

1 Answer

How can I find the mean absolute deviation?

Mean absolute deviation.
Let's break it down into its components.
Mean - Average
Absolute - absolute value - sign doesn't matter - if negative, make positive
Deviation - difference from the mean

Let's do an example. Population 3 7 4 2. Total 16. Mean (Average) 16/4 = 4.

Deviations
3 - 4 = -1 absolute value 1
7 - 4 = 3
4 - 4 = 0
2 - 4 = -2 absolute value 2

Sum of these deviations 1 + 3 + 0 + 2 = 6
Mean (average) of these deviations is 6 / 4 = 1.5.

Good luck,

Paul

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How to calculate mean

The mean is (1+5+9)/3 = 5.
The squared deviations are (1-5)^2=16, (5-5)^2=0, and (9-5)^2=16.
The sum of the squared deviations are 16+16 = 32.
Divided by one less than the number of data points, 32/(3-1) = 16.
The square root of 16 is 4. This is the sample standard deviation.

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How can i store info to get standard deviations??

Use the STAT Editor. Refer to the "Statistical Calculation" section beginning on page E-44 of the manual. If you need a manual, you may download one here.

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1 Answer

How to calculate the standard deviation? casio power graphic fx-7400G Plus

Here are the capabilities of the Casio calculators.
The screen captures may not look like ones taken from the FX-7400G
plus display but the instructions are accurate.
In stat enter the values in List1 and the frequencies in List2 (if doing paired variable statistics)
Press the key corresponding to the CALC tab

Press the 1-var tab and you get the results as seen on the screen with title 1-variable.
Other screens show some two-variable stats or regressions.

Use you knowledge of sample standard deviations and
population standard deviation to select which is relevant to your case.
They are given by xsigma-n and xSigma n-1

Aug 15, 2011 | Casio FX-7400G Plus Calculator

1 Answer

Where is the standard deviation button?

There isn't one. Press the "STAT VAR" button to bring up the statistics menu. "Sx" and "Sy" will give you the sample standard deviations, while "sigma x" and "sigma y" will give you the population standard deviations.

When I say "sigma" I mean the lower case Greek letter sigma, which looks like a lower-case "o" with a tail pointing to the right.

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If both tests are graed on a curve, who did better and why?

Jill. She scored two standard deviations above the mean, while he only scored one-and-a-half standard deviations above the mean.

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2 Answers

Standard Deviation

Hello,
If you want to do statistics with this calculator you press [MODE][3:STAT]. You have then 8 options 1:1-var, 2:A+BX, etc.
For one variable statistics you press 1. Enter the values for the X variable in the template. Once finished you press [SHIFT][1](STAT) then select the value you want ( n, x bar , and the standard deviations (X sigma n) and (X sigma n-1).
Hope it helps.

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2 Answers

Standard deviation

Enter the first number, 1.

Hit the σ+ (Sigma+) key. ( n=1 will appear in the window)

Enter the second number, 1.

Hit the σ+ (Sigma+) key. (n=2 will appear in the window)

. . . . .

Enter the last number, 7.

Hit the σ+ (Sigma+) key. (n=7 will appear in the window)

Hit 2nd x2 (by hitting the 2nd key you are actually selecting the x-bar written above the key.) This gives you the mean.

Hit 2nd sqrt(x). This gives you the sample standard deviation which we will use in class.

Make sure you turn your calculator off and on for new data sets.

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1 Answer

Standard deviation

1. Put the data into a list.
2. OneVar list will produce a screenful (and more) of one-variable statistics.

OneVar is available through the STAT CALC menu. "list" in step 2 is the name of the list created in step 1.

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1 Answer

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).

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