1. An estimator that tends to produce more accurate estimates of the population parameter
as the sample size increases is best characterized as a(n) _.
Biased estimator
Efficient estimator
Unbiased estimator
Consistent estimator*
2. What is
0.48
0.4
1.
If A and B are independent events, then _.
*

2.
Exhibit 51. Consider the following discrete
probability distribution.
Refer to Exhibit 51. What is the probability
that X is greater than 0?
0.10
0.35
0.55*
0.65
3.
Exhibit 56. The number of cars
1.
Which of the following is an example of a sample statistic?
*


2
2.
Which of the following is not a population parameter?
*


2
3.
Bias can occur in sampling. Bias refers to _.
The division of the population into overlapping groups
The creatio
The waiting time at an elevator is uniformly distributed between 30 and 200 seconds. Find the mean and standard
deviation of the waiting time.
115 seconds and 49.07 seconds*
1.15 minutes and 0.4907 minutes
1.15 minutes and 24.08333 (minute)2
115 secon
Exhibit 62. Gold miners in Alaska have found, on average, 12 ounces of gold per 1000 tons of
dirt excavated with a standard deviation of 3 ounces. Assume the amount of gold found per
1000 tons of dirt is normally distributed.
Refer to Exhibit 62. What i
1.
Which of the following represents an appropriate set of hypotheses?
*
2.
A Type I error occurs when we _.
Reject the null hypothesis when it is actually true*
Reject the null hypothesis when it is actually false
Do not reject the null hypothesis whe
1.
Which of the following meets the requirements of a stratified random sample?
A population contains 10 members under the age of 25 and 20 members over the
age of 25. The sample will include six people who volunteer for the sample.
A population contain
1.
What is probability?
Any value between 0 and 1 is always treated as a probability of an event.
A numerical value assigned to an event that measures the number of its occurrences.
A value between 0 and 1 assigned to an event that measures the likelih
1. Consider the following discrete probability distribution.
x
P(X = x)
15
0.14
22
0.40
34
0.26
40
0.20
a. Is this a valid probability distribution?
Yes
c. What is the probability that the random variable X is less than 40? (Round your answer to 2 decimal
A qualitative variable assumes meaningful numerical values.
True
False
*
A professor's rank (assistant, associate, and full), as well as salary, represent ordinal data.
True
False
*
A bar chart depicts the frequency or relative frequency of each categ
QMB 2102 STUDY GUIDE
CHAPTER 6 &7
CH. 6:
Network flow problems:
o Transportation problem
o Assignment problem
o Transshipment problem
o Shortestroute problem
o Maximal flow problem
Transportation problem: arises frequently in planning for the distribut
QMB 2102 NOTES
CHAPTER 1: INTRODUCTION
Management science: an approach to decision making based on the scientific method.
o Operations research
o Decision science
1.1: PROBLEM SOLVING AND DECISION MAKING
Problem solving: the process of identifying a dif
QMB 2102 NOTES
CHAPTER 2: AN INTRODUCTION TO LINEAR PROGRAMMING
Linear programming; a problemsolving approach developed to help managers make
decisions.
Constraints: restrictions
2:1 A SIMPLE MAXIMIZAION PROBLEM
Problem formulation or modeling: the pr