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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