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A researcher examined the number of hits on a computer security Internet site for 2 weeks preceding Y2K and for 2 weeks following Y2K

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A researcher examined the number of hits on a computer security Internet site for 2 weeks preceding Y2K and for 2 weeks following Y2K. She found that the number of hits on the site decreased following Y2K. What type of design is this, and what kinds of prob¬ lems do you see with her conclusion that Y2K was responsible for the effect? Can you think of a better design?