hw2_answer_econ120a_w08 - Economics 120A Professor Yongil...

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Economics 120A Name: _________________________ Professor Yongil Jeon Winter 2008 Student ID#: _________________________ Answer to Homework #2 – Winter 2008 (Part of Midterm and Final Exams, Summer 2007) Answer all questions on separate paper. This problem set should be handed in to Professor Jeon at the beginning of your class on Wednesday, February 27th, 2008. Problem sets may not be handed in once solutions have been distributed. Please write down your name and PID clearly. Good luck! 1. True/False (2 points each) 1. The probability of at least one head in two flips of a coin is 0.75. Answer: True 2. If a random variable can take on a countably infinite number of values, one would use a discrete distribution. Answer: True 3. The variance of a random variable will always be greater than its standard deviation. Answer: False 4. The binomial distribution is most symmetric when p equals 0.5. Answer: True 5. A Bernoulli process is a sequence of independent trials with two possible outcomes whose probabilities can change between trials. Answer: False 6. A simple random sample is selected when every object in the sample has an equal probability of being selected and the objects are selected independently. Answer: True 7. The Central Limit Theorem states that as the sample size increases, the distribution of the population mean approaches the normal distribution.
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