In the article "Nitrate Contamination of Alluvial Groundwaters in the Nakdong River Basin, Korea" (J. Min, S. Yun, et al., Geosciences Journal, 2002: 35-46), 41 water samples taken from wells in the Daesan area were described, and 22 of these were found to meet quality standards for drinking water. Thirty-one samples were taken from the Yongdang area, and 18 of them were found to meet the standards. Can you conclude that the proportion of wells that meet the standards differs between the two areas?