卡方检验

				%例题4.2.3，符号检验
				x=[15.1,15.0,14.8,14.9,14.6,15.5,14.8,15.2,15.0,14.7,15.3,15.4,14.7,15.2,14.9,14.9,15.0,14.7,14.8,14.7];
				y=[15.2,15.0,14.6,14.8,14.7,15.2,14.7,15.4,15.1,14.6,15.0,15.2,14.9,14.8,14.6,14.7,15.3,14.8,14.6,14.6];
				fhjy(x,y)