premise: North Las Vegas is a city in Clark County, Nevada, United States, located in the Las Vegas Valley. As of the 2010 census it had a population of 216,961, with an estimated population of 226,877 in 2013. The city was incorporated on May 16, 1946. It is located in the Las Vegas–Paradise, NV MSA and is the fourth largest city in the state of Nevada.
hypothesis: North Las Vegas lost population between 2010 and 2013.
reason: Based on the text the population grew at a healthy clip between 2010 and 2013. I'm not sure how the system missed this one.