A group of 135 candies were randomly drawn from a shipment of 2,000 candies. The color of candies in the sample are recorded in the table below. For the entire shipment, for every 135 candies there are 50 red, 25 yellow, 35 blue and 25 orange. The following contingency table is used to evaluate possible goodness of fit. How many degrees of freedom is required to determine the critical value of this test? Sample Red 18 Yellow 30 Blue 52 Orange 35 TOTAL 135 1 2 3 4