A poultry grower would like to find out which of two kinds of feeds is better for the growth of chickens. He used one kind of feed for one group ( n,= 15) and another kind for a second group of chickens ( n2=12) . After 45 days, he computed the mean weights of the chickens in two groups and obtained the following data: X , = 1250 grams, S, = 22; X2 = 1180, $2 = 25. He decided in the 0.01 level of significance