3. You are a medical researcher working for Pfizer, which has developed a new meningococcal vaccine. Over a five year period, you tested the effectiveness of the vaccine to monkeys and then challenging the monkeys with meningitis bacteria. Without the vaccine, meningitis is fatal in 15% of the population (the 15% was determined from the monkeys who received a placebo- you can check this from the data). The following data results from the vaccine trials. Use the data from those monkey's receiving the vaccine (the middle column) to calculate a Chi-Square value and evaluate the null and experimental hypothesis. (Follow the steps as in problem #1 on a separate sheet of paper.) Number of Monkeys Surviving and Dying with and without the Meningitis vaccine Number of Monkeys Number of Monkeys Receiving Vaccine Receiving a Placebo 234 41 Monkeys who survived Monkeys who died 293 21

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