premise: Haverstraw is a village incorporated in 1854 in the town of Haverstraw in Rockland County, New York, United States. It is located north of Congers, southeast of West Haverstraw, east of Garnerville, northeast of New City, and west of the Hudson River at its widest point. According to the 2013 U.S. Census estimate, the population was 12,102, an increase from the 2010 Census population of 11,910.
hypothesis: The population for Haverstraw had a higher census estimate in 2011 than the year before, 2010. 
reason: The census estimate was higher in 2013, when compared to the census of 2010. But, 2011 census could have increased or dropped. The agent may have found it difficult to determine, as it may have seemed that it was an increase.