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The Fast Food Association of America claims that 57% of adults age 18-29 eat fast food at least once a week. Suppose 0.57 is the population proportion p of adults age 18-29 that eat fast food at least once a20% week.20% 20% 20% 20% In a sample of n=200 adults age 18-29, let pˆ be the sample proportion that ate fast food in the past week. What is E ( pˆ ) ? 10 1. 2. 3. 4. 5. 0.43 114 0.57 86 0.2451 1. 2 3. 4 5. The Fast Food Association of America claims that 57% of adults age 18-29 eat fast food at least once a week. Suppose 0.57 is the population proportion p of adults age 18-29 that eat fast food at least once a week. In a sample of n=200 adults age 18-29, let pˆ be the sample proportion that ate fast food in the past week. What is SD( pˆ ) ? 10 1. 2. 3. 4. 25% 25% 25% 2. 3. 25% 0.57 0.00122 0.035 0.2451 1. 4. Sixteen percent of Americans do not have health insurance. In a random sample of n=500 Americans, what is the probability that the proportion pˆ that do not have health insurance is more 20% than 20% 0.20? 20% 20% 20% 10 1. 2. 3. 4. 5. .0074 .9927 .80 .003 .045 1. 2. 3. 4. 5. Determine E(X) from the given parameters of the population and the sample size. μ = 84 SD(X) = 12 n = 30 10 1. 2. 3. 4. 25% 25% 25% 2. 3 25% 12 5.477 84 15.336 1 4. Determine SD(X) from the given parameters of the population and the sample size. μ = 84 SD(X) = 12 n = 30 10 1. 2. 3. 4. 25% 25% 25% 2. 3. 25% 12 5.477 15.336 2.191 1 4. A 2008 study of concussions at VA Tech concluded that in a season college football players suffered an average of 50 strong blows to the head with a standard deviation of 16. What is the probability that a25% random 25% 25% 25% sample of 60 college football players results in a sample mean of 48 or fewer strong blows? 10 1. 2. 3. 4. 0.1665 0.8335 0.3335 0.1858 1. 2. 3. 4. The VP of quality control at Long John Silver’s wants drive-thru waiting times to be 60 seconds or less. Records obtained from the restaurants indicate that waiting times are skewed right 25% with mean 25% 58.3 25%seconds 25% and standard deviation 13.1 seconds. What is the probability that a random sample of 40 cars results in a sample mean time of 60 seconds or less? 10 1. 2. 3. 4. 0.5576 0.7941 0.2059 0.500 1. 2. 3. 4.