std=Math.sqrt(u.tcf*nx*ny*(nx+ny+1)/12);if(alt=='less'){z=(u.ux-mu)/std;}else if(alt=='greater'){z=(u.uy-mu)/std;}else if(alt=='two-sided'){z=Math.abs((u.big-mu)/std);}else{console.log('Unknown alternative argument');}
if(alt=='two-sided'){f=2;}