Q1. A probability function: A) is often referred to as the "cdf." B) specifies the probability that the random variable takes on a specific value. C) only applies to continuous distributions.
Q2. Which of the following could least likely be a probability function? A) X 1,2,3,4) p(x) = (x × x) / 30. B) X1,2,3,4) p(x) = x / 10. C) X1,2,3,4) p(x) = 0.2.
Q3. If a smooth curve is to represent a probability density function, what two requirements must be satisfied? The area under the curve must be: A) one and the curve must not rise above the horizontal axis. B) one and the curve must not fall below the horizontal axis. C) zero and the curve must not fall below the horizontal axis.
Q4. In a continuous probability density function, the probability that any single value of a random variable occurs is equal to what?
A) One. B) 1/N. C) Zero.
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发表于 2009-1-9 10:17
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