12. Suppose we have a multinomial population with four categories: A, B, C, and D. The null hy- pothesis is that the proportion of items is the same in every category. The null hypothesis is HPA Pa Pc P = .25 A sample of size 300 yielded the following results. A: 85 B:95 C: 50 D: 70 Use a = .05 to determine whether H, should be rejected. What is the p-value?