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9. In a population of 5000 subjects, 600 posses a certain characteristic. A sample of 120 subjects selected from this population contains 18 subjects who possess the same characteristic. What are the values of the population and sample proportions? 10. In a population of 9500 subjects, 75% have a certain characteristic. In a sample of 400 subjects selected from this population, 78% possess the same characteristic. How many subjects in the population and sample, respectively, possess this characteristic? 11. According to the U.S. Department of Health and Human Services, 44% of Americans take at least one prescription drug regularly. Assume that this percentage is true for the current population of Americans, and let p-hat be the proportion of Americans who take at least one prescription drug regularly in a sample of 900. Find the probability that the value of p-hat is a. between 0.43 and 0.46 b. greater than 0.48 12. The amounts of telephone bills for all households in a large city have a distribution that is skewed to the right with a mean of $96 and a standard deviation of $27. Let x-bar be the mean amount of telephone bills for a random sample of 90 households selected from this city. Calculate the mean and standard deviation of x-bar and describe the shape of its sampling distribution
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9) Population size N): 5000 Numbeb-4.. . Subjects Posses cethai a Pofuaion Pro Pastion p50060-12 : O Sample size Ln) 120 X 12 Sample-proportion ce):不, OIS 103 Population proportian (P)s 015 Nurober of subjects possess the same characlerislic x= 9125. Sq mple Size cD): 400 Sample mportion(n):a:78 /

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