LSAT Question HELP!!
The question:
A university study reported that between 1975 and 1983 the length of the average workweek in a certain country increased significantly. A government study, on the other hand, shows a significant decline in the length of the average workweek for the same period. Examination of the studies shows, however, that they used different methods of investigation; thus there is no need to look further for an explanation of the difference in the studies’ results.
The argument’s reasoning is flawed because the argument fails to.....
(the answer): Recognize that two different methods of investigation can yield identical results.
My answer: Distinguish between a method of investigation and the purpose of an investigation.
Can someone explain to me why my answer is wrong and why the correct answer was chosen? :)