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Question 7 2 pts A company claims that its new viral vaccine is at least 90% effective in preventing a contagious viral disease. Suppose that in a clinical trial with 3000 respondents, 2640 did not get infected by this disease. What is the appropriate alternative hypothesis? Let p be the true proportion of vaccinated people not infected by this disease. O p is greater than to 0.90 O p is less than 0.90 O p is equal to 0.90 O p is not equal to 0.90Question 10 2 pts A company claims that its new viral vaccine is 90% effective in preventing a contagious viral disease. Suppose that in a clinical trial with 3000 respondents, 2640 did not get infected by this disease. What is the p-value? O 0.9999 O 0.0001 O 0.5556 O 0.3454Question 9 2 pts A company claims that its new viral vaccine is 90% effective in preventing a contagious viral disease. Suppose that in a clinical trial with 3000 respondents, 2640 did not get infected by this disease. At 1% level of significance, what is the critical region? O z 1.96 O Z > 2.58 O z