W2017 Biol/Stat 2244B - No Risk Test 2-Answers& Solutions Question 11. The World

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W2017 Biol/Stat 2244B - No Risk Test 2-Answers& Solutions Question 11. The World Health Organization (WHO) has been closely tracking the country-wide occurrences of microcephaly in infants for countries known to have the Zika virus. WHO officials visited their national offices in a simple random sample of 37 out of the 80 countries known to have the Zika virys, and obtained a country-wide percentage of infants born with microcephaly from each of the visited countries. What is the most appropriate critica value for WHO officials to use to estimate (based on the data collected from the 37 countries) the typical country-wide percentage of microcephaly, in countries to have the Zika virus, with 99.5% confidence? Assume the relevant interval is valid. A. 2.58 B. 2.97 C. 2.81 D. 3.03 to Question 12. The ordered list below gives the differences (in years) between ages of actresses and actors when they won best leading actor/actress at the Oscars (an award given to movie stars). The differences are found suhtractin the age of the male winner from the age of the female winner for a given year. The

Explanation / Answer

we have from z table the criticial values

when the confidence interval is 99.5% from standard z table when we look we get values as 2.807

rounding off 2.81

so answer is option c

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