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Math Help - Frequency Distribution-Normal Distribution-Eye Inspection

  1. #1
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    Frequency Distribution-Normal Distribution-Eye Inspection

    How can we tell when a frequency distribution is normally distributed.


    The frequency distribution below on eye inspection appears to have a normal distribution b'cos :

    The frequency starts low and then increase to some maximum then decrease to a low frequency.

    Is my observation right?


    Thanks

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    65-69/4
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  2. #2
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    Quote Originally Posted by KayPee View Post
    How can we tell when a frequency distribution is normally distributed.


    The frequency distribution below on eye inspection appears to have a normal distribution b'cos :

    The frequency starts low and then increase to some maximum then decrease to a low frequency.

    Is my observation right?


    Thanks

    Selling prices of Pontiac/Frequency
    ($ 000)

    60-64/1
    65-69/4
    70-74/5
    75-79/15
    80-84/7
    85-89/6
    90-94/1
    I suggest you apply a goodness-of-fit test.
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  3. #3
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    Question goodness-of-fit test

    Quote Originally Posted by mr fantastic View Post
    I suggest you apply a goodness-of-fit test.
    Mr Fantastic


    This is the first time I ever heard of this test.

    How would I apply that to the data above.

    Besides would you consider 'eye inspection' a 'no-no'.
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  4. #4
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    Quote Originally Posted by KayPee View Post
    Mr Fantastic


    This is the first time I ever heard of this test.

    How would I apply that to the data above.

    Besides would you consider 'eye inspection' a 'no-no'.
    An 'eye inspection' gives you an idea of the sort of distribution you might want to test against.

    goodness of fit distribution - Google Search=
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