Discussion
During the period 1960-2002, 420 studies completed and based on
Answer: C
The 420 studies were based on both quantitative and qualitative approaches.
The passage says that forecasts are traditionally generated by either quantitative or qualitative approaches, and that 420 studies of tourism demand forecasting appeared in 1960-2002. The key reads these studies as covering both kinds of approach.
The time-series approach is only one of the statistical methods mentioned, so the studies were not limited to it. Quantitative alone and qualitative alone each leave out half of what the passage names.
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