match with the correct answer An effective vaccine would reduce the proportion of exposed persons contracting a disease. A pharmaceutical company wants to test the effectiveness of a new vaccine in preventing a certain disease. It is expected that 40% of unvaccinated exposed people will contract the disease. A group of 48 exposed persons volunteered to be vaccinated. Later, two of the volunteers contracted the disease. Test H0: 0.40 (vaccine ineffective) at = 0.01. . 1-tailed test of proportion with negative critical value 2. 2-tailed test of mean with both negative and positive critical values 3. 1-tailed test of mean with negative critical values 4. 1-tailed test of paired-data with positive critical value 5. 2-tailed test of means of 2 independent populations