1. Which distribution is helpful in testing hypotheses about variances? binomial
ID: 2900380 • Letter: 1
Question
1. Which distribution is helpful in testing hypotheses about variances?
binomial distribution
a)
F distribution
b)
normal distribution
c)
Poisson distribution
d)
exponential distribution
2. Which of the following is not a characteristic of a good decision?
a) based on logic
b) considers all available data
c) considers all possible alternatives
d) employs appropriate quantitative techniques
e) always results in a favorable outcome
3. Evaluating all possible values of a variable in a model is called
a)
trial and error.
b)
complete enumeration.
c)
an algorithm.
d)
variablization.
e)
None of these
4. A ________ is a numerical statement about the likelihood that an event will occur.
a) mutually exclusive construct
b) collectively exhaustive construct
c) variance
d) probability
e) standard deviation
5. Which of the following statements concerning the F distribution is true?
a)
The F distribution is discrete.
b)
The F distribution is symmetrical.
c)
The F distribution is useful in modeling customer arrivals.
d)
The F distribution is useful in testing hypotheses about variance.
e)
The F distribution is interchangeable with the normal distribution for large sample sizes.
6.The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses more than 350 minutes?
a) 0.001
b) 0.999
c) 0.618
d)
0.382
e) None of these
7.The Hurwicz criterion is also called the criterion of ________.
a) regret
b) equality
c)
optimism
d)
realism
e)
pessimism
8.The classical method of determining probability is
a) subjective probability.
b) marginal probability.
c) objective probability.
d) joint probability.
e) conditional probability.
9.Which of the following is not one of the steps in the quantitative analysis approach?
a) Defining the Problem
b) Developing a Solution
c) Observing a hypothesis
d) Testing a Solution
e) mplementing the Results
10. A dry cleaning business offers a pick-up and delivery service for a 10 percent surcharge. Management believes 60 percent of customers will take advantage of this service. They are also considering offering customers the option of opening an account and receiving monthly bills. They believe 60 percent of their customers (regardless of whether or not they use the pick-up service) will use the account service. If the two services are introduced to the market, what is the probability a customer uses both services?
a)
0.12
b)
0.60
c)
0.36
d)
0.24
e)
None of these
11.The time required to travel downtown at 10 a.m. on Monday morning is known to be normally distributed with a mean of 40 minutes and a standard deviation of 5 minutes. What is the probability that it will take less than 40 minutes?
a)0.50
b)0.20
c)
0.80
d)
1.00
e)
None of these
12.Another name for a decision table is a ________.
a)
payment table
b) payout table
c)
payoff table
d)pay-up table
e)
decision tree
13.The Department of Motor Vehicles (DMV) can service customers at a rate of 20 per hour (or 1/3 per minute) when it comes to license renewals. The service time follows an exponential distribution. What is the probability that it will take less than 2 minutes for a particular customer to get a license renewal?
a)
1
b)
0.487
c)
0.513
d)0
e)
0.1
14. In the construction of decision trees, which of the following shapes represents a state of nature node?
a)
square
b)
circle
c)diamond
d)triangle
e)None of these
The number of phone calls coming into a switchboard in the next five minutes will either be 0, 1, or 2. The probabilities are the same for each of these (1/3). If X is the number of calls arriving in a five-minute time period, what is the mean of X?
a)1/3
b)
2/3
c)
1
d)4/3
e)
None of these
binomial distribution
a)
F distribution
b)
normal distribution
c)
Poisson distribution
d)
exponential distribution
Explanation / Answer
1. A
2. C
3. B
4.D
5. D
6. P(x>350) =P( z> -3)= 0.999 ans B
7. B
8. C
9. E
10. C
11. A
12. E
13. B
14 A
15. A
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