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FrequencyDistribution

# FrequencyDistribution - Next you see X 2 = Just put in the...

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Let Your Calculator Do the Work! Now that you have learned how to construct frequency distributions and compute the mean and standard deviation by hand. Here is a handy tip: Use the statistics function of your calculator. I am going to explain how to use the TI-30X IIB and IIS (same). These instructions match the ones provided with your calculator. First, you put the calculator in stats mode. Turn it on then press 2 nd (top left button) and then press the DATA button (it says STAT above the button). The screen will have “1-VAR” underlined. Press ENTER. You will see that it says STAT DEG in the bottom right corner of the screen. Press the DATA button (don’t press 2 nd this time). You will see X 1 =. Put in the value for the first X in the frequency distribution. Press the down arrow (Top right of calculator). You will see “FRQ=1.” If the frequency of your X 1 is 1, then just press the down arrow. If it is something other than 1 enter the appropriate frequency value then press the down arrow.
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Unformatted text preview: Next you see X 2 =. Just put in the value for the second X of the distribution and then down arrow to FRQ and either leave it as 1 or change it to the appropriate value. Just keep repeating this sequence until you have entered the last X and its frequency. Finally, press the STATVAR button and wallaaaaa, there’s all the answers! You will see n and it gives you the size of your sample (which is the sum of the frequencies). Push the right arrow and you will see the mean, press the right arrow again and you will see S x, which is the sample standard deviation of your X values. The next one is a fish looking symbol called alpha which is the population standard deviation (we don’t need that). Keep pressing the right arrow and you will find the sum of X and the sum of X 2. Isn’t it just beautiful? I bet you wish I would have told you sooner, but then you would not understand what standard deviation actually is. Enjoy....
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