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Hello students.
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Today we will discuss about this question.
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In this question, we are given that a vaccine to prevent a servicever virus was given to children within the first year of life as a part of drug study.
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The study reported that of the 335 children randomly assigned to the vaccine.
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So here n that is equal to this and 50 got the virus.
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Of the 1655 children randomly assigned placebo and 43 watt virus.
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Then here we need to find the sample percentage of children who caught the virus in each group.
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So here in part a we need to find the sample percentage of children.
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Of children who caught virus in each group who caught virus.
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Who caught virus.
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And in part b, we need to determine whether the vaccine is effective in reducing the chance of catching the virus using the significance level that is the alpha that is equal to 0 .10.
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We need to find the conclusion or we need to test the conclusion.
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As the hypothesis test.
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So here, first of all, for the part a, we can write p1 cap that is equals to x1 divided by n1, so that is equals to 50 divided by 3335, so that is equals to 0 .015...