University:
Rice University
Course:
STAT 310 | Probability and Statistics
Academic year:

2019
Views:

164

Pages:

1
Author:

folclord7m

1. The time required to drive from New York to New Mexico is a discrete random variable. False 2. A random variable is a function or rule that assigns a number to each outcome of an experiment. True 3. The number of home insurance policy holders is an example of a discrete random variable True 4. The mean of a discrete probability distribution for X is the sum of all possible values of X, divided by the number of possible values of X. False 5. A table, formula, or graph that shows all possible values a random variable can assume, together with their associated probabilities, is referred to as probability distribution. True 6. Another name for the mean of a probability distribution is its expected value. True 7. For a random variable X, E(X + 2) − 5 = E(X) − 3, where E refers to the expected value. True 8. For a random variable X, V(X + 3) = V(X + 6), where V refers to the variance. True 9. For a random variable X, if V(cX) = 4V(X), where V refers to the variance, then c must be 2. True Indicate the answer choice that best completes the statement or answers the question. 10. Which of the following is not a required condition for the distribution of a discrete random variable X that can assume values xi? a. 0 ≤ p(xi) ≤ 1 for all xi b. c. p(xi) > 1 for all xi d. All of these choices are true.