week3_problems

week3_problems - Econ41:StatisticsforEconomists...

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Econ 41: Statistics for Economists Section 1I,1J Mee Yeon Kim Week3 4.127  A random sample of 250 adults was taken, and they were asked whether they prefer watching sports or  opera on TV. The following table gives the two-way classification of these adults.  Prefer watching sports (S) Prefer watching opera (O) Male  (M) 96 24 Female  (F) 45 85                             a. If one adult is selected at random from this group. Find the prob. That this adult 1. prefers watching opera 2. is a male 3. prefers watching sports given that the adult is a female 4. is a male given that he prefers watching sports 5. is a female and prefers watching opera 6. prefers watching sports or is a male b. Are the events “female” and “prefers watching sports” independent? Are they mutually exclusive? Explain why or why  not.  4.136  A player plays a roulette game in a casino by betting on a single number each time. Because the wheel  has 38 numbers, the probability that the player will win in a single play is 1/38. Note that each play of the game is  independent of all previous plays.  a. Find the probability that the player will win for the first time on the 10 th  play. b. Find the probability that it takes the player more than 50 plays to win for the first time. c.
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This note was uploaded on 10/14/2009 for the course ECON 41 taught by Professor Guggenberger during the Fall '07 term at UCLA.

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week3_problems - Econ41:StatisticsforEconomists...

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