Our feelings about the issue led our class to direct a survey among local residents in Fordham, in order to determine statistically how often the latter use Greendale Park.

determine 是动词，由前缀 de-（表示"完全、彻底"）和词根 termine（来自拉丁语 terminus，意思是"界限、终点"）组成，字面意思是"划定界限"，引申为"确定、决定"的意思。在句中表示通过调查来"统计确定"居民使用公园的频率。