Chi Square Calculators

I SDK think this page and links is fully functional (9:18 PM) 2.6.08. 

   You are the lucky # personage to visit this world.

        In a separate activity on Chi Square, you learned how to calculate this statistical test manually.  This gives you an appreciation for the test and also how time consuming and subject to math errors it can become.  Do you really want to calculate Chi Square six times comparing our data to six different authors, trying to figure out which of these authors our data best fits?  But you might really want to compare both our class data and our multi-class data to these authors, so that’s twelve not six calculations.  What if the darn teacher wants the best data available?  Oh my goodness gracious!  Sounds like a lot of number crunching!  Several people have already programmed Chi Square Calculators into web sites, but alas they did not account for the six authors in our study.  That gave SDK an idea, why not design your own calculator?  Since I don't know html programming language, I went to Excel spreadsheet.  That's what spreadsheets do -- crunch numbers.  All you do is input the data and all the number crunching is done for you.  You are still responsible for being able to calculate Chi Square manually with sample data which will be on your next lab test. 

I made a complete Excel Spreadsheet that allows you to input your data (team, class, multi-class and even multi-year) directly and compare your data to the six authors stated in the "Genetic Recombination During Meiosis in the Mold Sordaria" hand-out that you already read.  Chi Squares will this time be calculated for you, but you must be able to interpret what a value of Chi Square means and answer some additional questions based on this material.  Don't forget that you have two Observed numbers for each size data (team ... multi-year).   Of course they are for Non-recombinants (listed first) and Recombinants (listed second).

    Link to actual Chi Square Calculator    It works as of 10:45 AM on 2/6/08  -- Victory; thanks to
    Mr. Caldaro (AP Physics teacher!)

Some web sites for evaluating Chi Square with respect to degrees of freedom and probability are:
Usually you input values for two of the three underlines terms and the software supplies the third value!  You can and will do this from a manual table (Table IV in the 8 page Chi Square white hand-out from last week &
also repeated in the write-up packet), but if you're not sure that you read the provided table correctly, either of the next two web sites could be used to verify data.  Yes Virginia, when there are two columns (coins or Sordaria data), the degrees of freedom is one.  We will not have any other degrees of freedom in our analyses. 
And Viginia wants to remind you that we are constantly using a probability level (p level) of .01.  We will not reject our Null Hypothesis unless the Chi Square exceeds the stated value for p = 0.01.  I believe that number
was in the original Chi Square packet last week.  We could always look back; could we not?

http://faculty.vassar.edu/lowry/tabs.html#csq OR  http://www.stat.tamu.edu/~west/applets/chisqdemo.html

If you want to preview some of the text and photos on the mating of Sordaria and the results in asci, then please click on this Photo link.

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