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Measuring the impact of an intervention

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    Sorour
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    Hello all.
    I am currently setting up an estimation forum, the purpose of which is to assess the projected cost of incoming change requests, and get estimates closer to actual delivery costs.
    I have a baseline of historical variance between initial estimate and actual delivery costs for c. 20 pieces of work and, have captured each as % variance from initial estimate.
    I have taken my ‘Y’ to be % variance and my ‘x’ is pre/post intervention.
    My question is this- given that the Y is a percentage, what test is most appropriate to try and prove the effectiveness of the forum?  Alternatively, could you suggest a simple graphical method to illustrate trend? 
    Many thanks,
    Paul

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