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Math Help - Data - rounding percentages.

  1. #1
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    Data - rounding percentages.

    Hello all, I'm just trying to figure this out.

    If we have a sample of 135
    133 yes
    2 no

    then my probability of "yes" is 133 over 135 or 98.5185%
    "no" would be 100-98.5185 or 1.48148%

    If I would try to apply this result to the next 100 samples
    since I can't say half a yes or half a no....I would round up or down?
    or 2 "no's" out of 100 and 98 "yes's"

    I'm just rusty at this. Any help would be appreciated.

    Thanks,
    Carl
    Last edited by mr fantastic; October 10th 2011 at 07:56 PM. Reason: Re-titled.
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  2. #2
    Master Of Puppets
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    Re: Basic question help

    98.5 rounds to 99. So you would have 99 yes and 1 no.
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  3. #3
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    Re: Basic question help

    This may not be a math question per say, but would the application have any bearing on which way you round. Imagine instead of yes and no samples it was number of bicycle crashes or something with a social context. Would that matter?
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  4. #4
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    Re: Data - rounding percentages.

    Quote Originally Posted by CTolbert56 View Post
    Hello all, I'm just trying to figure this out.

    If we have a sample of 135
    133 yes
    2 no

    then my probability of "yes" is 133 over 135 or 98.5185%
    "no" would be 100-98.5185 or 1.48148%

    If I would try to apply this result to the next 100 samples
    since I can't say half a yes or half a no....I would round up or down?
    or 2 "no's" out of 100 and 98 "yes's"

    I'm just rusty at this. Any help would be appreciated.

    Thanks,
    Carl
    Your sample size is too small to give an estimate any better than about 0-4 "no"s on a subsequent random sample from the same population.

    CB
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