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Math Help - Analysis of vehicle crashes

  1. #1
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    Analysis of vehicle crashes

    I'm having an issue with analysis of crash history on a road, and I'm a bit rusty on my statistical analysis.
    I've got crash data for 2 time periods, 2007-2012 and 2013 and I want to compare the two sets to see if the crash rate has decreased by a statistically significant margin. To analyse the 2007-2012 data set (which has 5 data points, one for each year) should I perform a t-distribution analysis or a normal distribution? And once I've analysed the 2007-2012 data, can I compare that to the 2013 result as a null hypothesis to say that if the 2013 result falls outside the 95% confidence level then the road improvements have had a statistically significant effect on the crash rates?
    Also, is it valid to assume that the cash rates will follow a normal distribution?

    EDIT - also, i have a bad feeling I may need to use a poisson distribution
    Last edited by dinNA89; August 13th 2014 at 12:58 AM.
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  2. #2
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    Re: Analysis of vehicle crashes

    I think I should re-phrase the question.
    I have detailed crash data for the 2007-2012 detailing all crashes in that period. I have 8 months of post upgrade crash history. I want to compare these two data sets to see if there has been a statistically significant decrease in crashes, how would I go about this?
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  3. #3
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    Re: Analysis of vehicle crashes

    Ithink poisson distriution is better becaulse we have pointy data
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