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Math Help - Stats Quizz !! help me !!

  1. #1
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    Unhappy Stats Quizz !! help me !!

    This is my tutorial question but i do not understand the meaning of question B and C..Please help me..

    Suppose the funnel experiment was conducted 17 times with the following results(in sec.):
    5.3, 6.2, 4.8, 6.4, 5.2, 5, 6.7, 4.2, 4.3, 6.8, 4.4, 4.8, 7.1, 5.6, 6.6, 5, 4.3

    a.) What proportion of outcomes are less than or equal to 5.0 seconds?


    b.) What proportion of outcomes are within one standard deviation of the
    mean?

    c.) What proportion of outcomes are within two standard deviations of the mean?
    Thank you
    Last edited by Alen Won; September 19th 2008 at 07:38 PM.
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  2. #2
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    Quote Originally Posted by Alen Won View Post
    This is my tutorial question but i do not understand the meaning of question B and C..Please help me..

    Suppose the funnel experiment was conducted 17 times with the following results(in sec.):
    5.3, 6.2, 4.8, 6.4, 5.2, 5, 6.7, 4.2, 4.3, 6.8, 4.4, 4.8, 7.1, 5.6, 6.6, 5, 4.3

    a.) What proportion of outcomes are less than or equal to 5.0 seconds?

    Mr F says: Where are you stuck here? How many values are there? How many are less than or equal to 5 seconds? Do you know how to find a proportion?


    b.) What proportion of outcomes are within one standard deviation of the
    mean?

    c.) What proportion of outcomes are within two standard deviations of the mean?


    Thank you
    b.) and c.): Have you calculated the mean and standard deviation of the data? If so, what values do you get?
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  3. #3
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    Wink Yes..I got the answer for question..A

    I got 0.47 for question A..

    Mean is 5.453
    Standard deviation is 0.986

    And I do not under stand one standard deviation..and two standard deviation ..
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  4. #4
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    Quote Originally Posted by Alen Won View Post
    I got 0.47 for question A.. Mr F says: Correct.

    Mean is 5.453
    Standard deviation is 0.986

    Mr says: Both correct.

    And I do not under stand one standard deviation..and two standard deviation ..
    Quote Originally Posted by Alen Won View Post
    [snip]
    b.) What proportion of outcomes are within one standard deviation of the
    mean?

    c.) What proportion of outcomes are within two standard deviations of the mean?
    b.) \bar{x} \pm s_x = 5.453 \pm 0.986 = 4.444, ~ 6.416. So have to find the proportion of outcomes that lie between 4.444 and 6.416.

    c.) is done in a similar way.
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