A statistician demonstrated how to test the efficacy of an HIV vaccine. He repor

Question

A statistician demonstrated how to test the efficacy of an HIV vaccine. He reported the results in grug and 30 AIDS patients who were treated with a placebo (no vaccination). The table shows the follow-up period. Complete parts a through e. No What are the consequences if the assumptions are violated? Choose the correct answer A. The test statistic may not have a chi^2 distribution. B. H_0 must be rejected. C. Vaccine and MN strain are independent. c. In the case of a 2 times 2 contingency table, R. A. Fisher developed a procedure for computing the exact p-value for the test. The method utilizes the hypergeometric probability distribution. Consider the hypergeometric probability shown on the right which represents the probability that 2 out of 7 vaccinated AIDS patients test positive and 23 out of 30 unvaccinated patients test positive-that is, the probability of the result shown in table, given that the null hypothesis of independence is true. compute this probability. (7/2)(30/23)/(37 25) The probability is p =. (Round to four decimal places as needed.)

Explanation / Answer

The table is not displayed.

c) probability is: 21*2035800/1852482996=0.023078

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