A doctor would like to evaluate whether flu-frequency is different among patients of various ages. He groups his most recent 12 patients into four groups according to age (pediatric, young ad ult. older adult. senior), and counts the frequency of their flu-related visits. Below is his data. Test the hypothesis that u frequency is different among pediatric, adult. older adult, and senior patients using an alpha level of .01 . ____ '11 1 1 3 1