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    Data Modeling and Forecast

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    (a) Make an Excel line graph of the data on computer viruses.
    (b) Discuss the underlying causes that might explain the trend or pattern.
    (c) Fit three trends (linear, exponential, quadratic).
    (d) Which trend model is best, and why? If none is satisfactory, explain.
    (e) Make a forecast for 2003, using a trend model of your choice or a judgment forecast.

    Virus Infections Per Month Per 1,000 PCs

    Year Viruses
    1996 10
    1997 21
    1998 32
    1999 80
    2000 91
    2001 103
    2002 105.

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