{"kind":"user","text":"We would like to reduce the confounding bias due to different fast-food chains and the location of restaurants. We only consider Burger King restaurants, and focus on the Burger King restaurants located in northern and southern NJ that are near PA, while excluding those in the Jersey shore and central New Jersey. What is the difference in the proportion of full-time Burger King employees in NJ (northern and southern only) and PA? Please round to the nearest thousandth."}