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Math Help - stats: chi-square test stat

  1. #1
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    stats: chi-square test stat

    Solve the problem.


    A coffeehouse wishes to see if customers have any preference among 5 different brands of coffee. A sample of 200 customers provided the data beolow. Calculate the chi-square test statistic χ to test the claim that the probabilities show no preference.

    Brand 1 2 3 4 5
    Customers 30 55 65 18 32


    how do i solve the problem?
    Last edited by comet2000; December 15th 2008 at 08:54 PM.
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  2. #2
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    If you have access to Excel, here's a tutorial on using it so you don't have to do the calc's by hand...which is explanatory at first and then painfully droll.


    <Instructions for Chi-Square with Excel -- Del Siegle -- Educational Research>

    Also...

    Vassar has some great links for online chi-test calculators.
    One-Way Chi-Square
    Contingency Table
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  3. #3
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    Quote Originally Posted by JeanetteR View Post
    If you have access to Excel, here's a tutorial on using it so you don't have to do the calc's by hand...which is explanatory at first and then painfully droll.


    <Instructions for Chi-Square with Excel -- Del Siegle -- Educational Research>

    Also...

    Vassar has some great links for online chi-test calculators.
    One-Way Chi-Square
    Contingency Table
    i need to know how to do it by hand.
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  4. #4
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    Quote Originally Posted by comet2000 View Post
    Solve the problem.


    A coffeehouse wishes to see if customers have any preference among 5 different brands of coffee. A sample of 200 customers provided the data beolow. Calculate the chi-square test statistic χ to test the claim that the probabilities show no preference.

    Brand 1 2 3 4 5
    Customers 30 55 65 18 32


    how do i solve the problem?
    The expected frequencies if there is no difference in preference are all 50.

    Now see here for the \chi^2 test.

    CB
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