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Math Help - Testing equality of variances using the F distribution.

  1. #1
    Nic
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    Testing equality of variances using the F distribution.

    I have a question where I have to test the equality of two variances using the F distribution at 5% level of significance.

    H0 is the variances are equal
    H1 is the variances are not equal.

    I woked my p-value out to be 1.19 and I have to use an F29,29 distribution.

    Do I have to use the 2.5 percent points table as it is a two-tailed test?

    Also if 1.19<F29,29 do I accept or reject H0?

    Can anyone help me?
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  2. #2
    Flow Master
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    Quote Originally Posted by Nic View Post
    I have a question where I have to test the equality of two variances using the F distribution at 5% level of significance.

    H0 is the variances are equal
    H1 is the variances are not equal.

    I woked my p-value out to be 1.19 and I have to use an F29,29 distribution.

    Do I have to use the 2.5 percent points table as it is a two-tailed test? Mr F says: Yes.

    You reject H0 if the calculated F-value is in either the the upper or lower 2.5 percent of the tail of the F distribution. The upper-tail critical value can be got directly from the tables. Do you know how to get the lower-tail critical value?


    Also if 1.19<F29,29 do I accept or reject H0? Mr F says: See above.

    Can anyone help me?
    ..
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  3. #3
    Nic
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    Thank-you.

    Is the lower tail critical value 1-upper critical value?
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  4. #4
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    Quote Originally Posted by Nic View Post
    Thank-you.

    Is the lower tail critical value 1-upper critical value?
    No. The distribution is not symmertic in that way.

    Try doing some research on it and if you're stuck post again in this thread.
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