Question about Texas Instruments TI-86 Calculator

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I Cant get the Correct Answers!

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??!!

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  • Anonymous Mar 21, 2014

    will not give the correct answer

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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

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Hi there,
There is a really great website called www.mathsatsharp.co.za that is dedicated to answering questions and helping people who own the Sharp scientific calculator range.
For Stats - i assume you are using the 535 with the table. Simply type in each data value, press = after each. Press change.
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I have 50 data points for which i need to find standard deviation on a classpad 330 , is there any quicker way to calculate than minusing the mean from every data point?


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)
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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.
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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.

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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
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How to i do std deviation and sample mean


Example: Enter the following x variables, and determine the sample and population standard deviations.
x = {1,2,3}
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  • 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].

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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:
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  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).
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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.

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

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standard deviation

calculate mean of a data set:

1. Turn calc. on or press MODE SeTUP
2.Press 3 for STAT
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5. WHen done entering press SHIFT 1
6.Press 5
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8.Press =

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