GMAT考试：Argument写作范文三十四_GMAT写作

GMAT考试：Argument写作范文三十四

　　A third problem with the argument is that the statistical evidence upon which it relies is too vague to be informative. The statistics concerning aircraft accidents may have been based on all types of accidents, whether minor or major. The statistics would be more meaningful if we knew that the accidents to which they refer were all of comparable severity. For all we know, the rate of casualty-causing accidents for medical helicopters is actually lower than for other aircraft. Additionally, we are not told the time period of the survey. An old survey or one that covered only a brief time period would be poor evidence in support of the authors claim.

　　In conclusion, the authors evidence does little to support the conclusion. To be persuasive, the author must at the very least acknowledge and rule out other possible causes of accidents that are unique to the medical-helicopter industry, in any event, a more effective argument would be based on a statistical comparison of accident rates under differing sets of training and maintenance guidelines within :he medical-helicopter industry, not among different aircraft industries.