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Unformatted text preview: students, what is the expected value of the sample mean amount of money spent on books? A) $400 B) Anywhere between $320 and $480. C) Anywhere between $392 and $408. D) This cannot be determined from the information given. 84. If a simple random sample of 100 undergraduate students is selected, what is the probability that these students spend more than $425 on books, on average? A) 0.00089 B) 0.2353 C) 0.3773 D) This cannot be determined from the information given. Use the following scenario to answer questions 85 and 86: In the university library elevator there is a sign indicating a 16‐person limit as well as a weight limit of 2500 lbs. Suppose that weight of students, faculty, and staff is approximately Normally distributed with a mean weight of 150 lbs and a standard deviation of 27 lbs. 85. When the elevator is full, we can think of the 16 people in the elevator as a simple random sample of people on campus. What average weight for these 16 people in the elevator will result in the total weight exceeding the weight limit of 2500 lbs? 86. What is the probability that the random sample of 16 people in the elevator will exceed the weight limit? 87. A simple random sample of 100 athletes is selected from a large high school. In the sample, there are 15 football players. What is the standard error of the sample proportion of football players? A) 0.00128 C) 0.05 B) 0.0357 D) 0.357 18 J Diaco Elements of Statistics I Supplemental Final Exam Review 88. A) B) A simple random sample of 60 blood donors is taken to estimate the proportion of donors with type A blood with a 95% confidence interval. In the sample, there are 10 people with type A blood. What is the margin of error for this confidence interval? 0.048 C) 0.094 0.079 D) 1.96 89. A) B) A simple random sample of 85 students is taken from a large university on the West Coast to estimate the proportion of students whose parents bought a car for them when they left for college. When interviewed, 51 students in the sample responded that their parents bought them a car. What is a 95% confidence interval for p, the population proportion of students whose parents bought a car for them when they left for college? (0.296, 0.504) C) (0.496, 0.704) (0.463, 0.737) D) (0.513, 0.687) 90. A) B) A simple random sample of 100 bags of tortilla chips produced by company X is selected every hour for quality control. In the current sample, 18 bags had more chips (measured in weight) than the labeled quantity. The quality control inspector wishes to use this information to calculate a 90% confidence interval for the true proportion of bags of tortilla chips that contain p
more than the label states. What is the value of the standard error of ˆ ? 0.0015 C) 0.063 0.038 D) 0.384 Use the following to answer questions 91–93: A simple random sample of 120 vet clinics in the Midwest reveals that the vast majority of them only treat small pets (dogs, cats, rabbits, etc.) and no large animals (cows, horses, etc.). Of the 120 clinics sampled, 88 responde...
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- Summer '09