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Math Help - Inferring a fact from a simple line graph (Multiple Choice Question)

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    Inferring a fact from a simple line graph (Multiple Choice Question)

    Dear all,

    I am having some trouble answering this multiple choice question on a graph and have posted the question with my thoughts below.

    Thank you very much.

    scherz0

    ---



    Given correct answer (hidden in white): D

    My thoughts:
    According to the question, y-axis = (Northern Ireland house price)  \div average of United Kingdom's house prices.

    A: I eliminated this choice since the change in the graph from 1980-1986 can be due to an increase in the UK average (and not necessarily a decrease in NI prices).

    B:
    I ruled out this option since the ups and downs could be caused by changes in the UK average (Certainly, the NI price could have even remained constant).

    C: I eliminated this choice because NI house prices could have decreased, which would explain the overall ratio's decrease in 1986.

    D: I ruled out this statement since the increases in the graph can follow from a decrease in the UK average, and not necessarily a rise in NI's prices.

    E: I decided against this choice, using the same reasoning as for choices A to D above.

    Where did I err?
    Last edited by scherz0; October 28th 2010 at 03:44 PM.
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