Self-test Questions


1	In throwing a pair of fair dice you calculate that the probability of throwing two sixes is 1/36. What sort of probability estimate is this?

		A)	A priori
		B)	Empirical
		C)	Subjective direct
		D)	Subjective indirect
		E)	Guesswork

2	If estimating probability empirically, it does not matter how many observations are taken.

		A)	TRUE
		B)	FALSE

3	Which of the following statements is untrue?

		A)	0 ≤ P(E) ≤ 1
		B)	If E is certain then P(E) = 1
		C)	P(E) = 1 / P(Ē)
		D)	If P is impossible then P(E) = 0
		E)

4	If two outcomes cannot happen in the same experiment, they are called:

		A)	Independent
		B)	Mutually exclusive
		C)	Empirical
		D)	Mutually exhaustive
		E)	Improbable

5	Which is the correct formula for the variance of a discrete probability distribution?

		A)
		B)
		C)
		D)
		E)

6	What is signified by the formula

		A)	Standard deviation of a probability distribution.
		B)	Standard deviation of random variable.
		C)	Variance of a random variable.
		D)	Mean of a probability distribution.
		E)	Mean of a random variable.

7	If X is a discrete random variable with has a uniform distribution defined as P(X=1)=P(x=2)=P(X=3)=P(X=4)=P(X=5)=0.2, then what is P(X ≤ 3)?

		A)	0.2
		B)	0.6
		C)	1
		D)	0
		E)	0.4

8	The Binomial distribution defines the probability of obtaining x ________ in n trials.

		A)	values
		B)	random variables
		C)	probabilities
		D)	experiments
		E)	successes

9	If P = 0.3 then the Binomial distribution is symmetrical.

		A)	TRUE
		B)	FALSE

10	Which single expression defines the mean and variance of a Poisson distribution?

		A)	λ = n*P
		B)	√λ = √(n*P)
		C)	λ2 = (n*P)2
		D)	(1 - λ) = (1 - nP)
		E)	1 / λ = 1 / (n*P)

11	The Poisson distribution models the ________ of a number of (low probability) successes in n trials.

		A)	random variable
		B)	index
		C)	quartile
		D)	probability
		E)	histogram

12	The Exponential and Normal distribution are ________ probability distributions

		A)	outrageous
		B)	variable
		C)	continuous
		D)	biased
		E)	discrete

13	The mean and standard deviation of the exponential distribution are the same.

		A)	TRUE
		B)	FALSE

14	What are the mean and standard deviation of a standard normal distribution?

		A)	μ=0 and σ=1
		B)	μ=0 and σ=1/ μ
		C)	μ=1 and σ=0
		D)	μ=10 and σ=100
		E)	μ=1 and σ=1

15	If X is a continuous random variable with mean μ, then P(X ≥ μ) = 0.5

		A)	TRUE
		B)	FALSE

2003 A McGraw-Hill Online Learning Centre
Any use is subject to the Terms of Use and Privacy Policy.
McGraw-Hill Education Europe is one of the many fine businesses of The McGraw-Hill Companies.