then the results of the poll would be extremely biased and unreliable.
Moreover, the author assumes that the poll indicates that advertising certain sale
will cause a general increase in sales. But the poll does not even address the issue of
increased overall sales; it informs us mainly that, of the people who purchased sales
items, more had read the ad than not. A much clearer indicator of the ads effectiveness
would be a comparison of overall sales on days the ad ran with overall sales on
otherwise similar days when the ad did not run.
In sum, this argument is defective mainly because the poll does not support the
conclusion that sales in general will increase when reduced-price products are
advertised in the Daily Gazette. To strengthen the argument, the author must, at the very
least, provide comparisons of overall sales reports as described above.
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