People can develop allergic reactions to sulfites, a family of chemical compounds often used for commercial food preservation. Researchers examined a sample of 21 hypertensive patients who had sought treatment regarding some allergic reaction. The published findings state that 9 of them were sensitive to sulfites. The proportion 'p-hat' for the proportion of hypertensive patients who were sensitive to sulfites is... (Give your answer as a two place decimal) Answer 1. 0.43 2. 0.32 3. 0.98 4. 0.56