Stats--Review-Chapt03

# Stats--Review-Chapt03 - Review Chapter 3 Probability 1...

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Review: Chapter 3: Probability 1. Concepts: (1) Event (2) Simple event (3) Sample space (4) Basic Rules for Computing Probability (a) Rule 1: Relative Frequency Approximation (b) Rule 2: Classical approach (c) Rule 3: Subjective Probabilities (5) Law of Large Numbers (6) Complementary Events (7) Compound Event (8) Independent Events and Dependent Events 2. Practicing Problems: Find the indicated probability. 1) A sample space consists of 80 separate events that are equally likely. What is the probability of each? A) 1 B) 0 C) 1/80 D) 80 2) On a multiple choice test, each question has 4 possible answers. If you make a random guess on the first question, what is the probability that you are correct? A) 4 B) 1 C) 1/4 D) 0 3) A die with 12 sides is rolled. What is the probability of rolling a number less than 11? 4) A bag contains 6 red marbles, 3 blue marbles, and 7 green marbles. If a marble is randomly selected from the bag, what is the probability that it is blue? Answer the question, considering an event to be "unusual" if its probability is less than or equal to 0.05. 11) Is it "unusual" to get a 12 when a pair of dice is rolled? A) Yes B) No 12) Is it "unusual" to get 3 when a pair of dice is rolled? A) No B) Yes 13) A multiple choice question has 14 possible answers, only one of which is correct. Is it "unusual" to answer a question correctly if a random guess is made?

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