A researcher is interested in what affects the amount of candy that is given out during Halloween. She randomly selects 15 5-year-olds, 15 10-year-olds and 15 15-year-olds and randomly assigns them to wear either a funny, cute or scary costume. Each participant is sent to the same randomly selected house in a middle income neighborhood to trick-or-treat and the number of pieces of candy was recorded for each participant. a. What are the IVs and DVs? b. State the null and alternative hypotheses for each component being tested