17. A researcher is interested in seeing if the amount of protein in a pigeon's feed influences the rate at which the pigeon pecks a key to receive a reward. She randomly assigns the pigeons to one of the three different types of feed: Type A, which has a large amount of protein; Type B, which had a moderate amount of protein; and Type C, which had very little protein. Are their significant differences in the rate of pecking based on food type? The data follows: Type A Type B 20 Type C k= 30 25 20 35 35 25 35 40 20 35 40 30 35 45 n1= n2= 13= N= XI= X2= X3 = EXI = EX2 = [X3 = T= EX12 = EX2? = [X32 = [X2 = a. Is this a between-subjects design or within- subjects design? b. What is the independent variable? ( c. What are the levels of the independent variabl d. What is the dependent variable? ( State the null hypothesis. (