X2: How many items?

You are about to enter a two columns of numbers. The first will be your data (usually counts) xi, the second will be your the corresponding expected results Ei. How many data items do you have to calculate (i.e., what is the value of k)? (There is no harm in over estimating: blanks will be ignored. Max=99, Min=2. Note however that data and expectations must be properly paired.)

Number of items: