Statistics
Prof. Peiran Jiao
Homework 3 Answers
Part I. True or False
Write your answers here:
FFFFF TFTF
1.
P(A) + P(B) = 1 for any events A and B that are mutually exclusive.
Ans: F
2.
The mean of a discrete probability distribution for X is the sum of

CHOSUN UNIVERSITY SEOK-GANG,PARK
CHAPTER 2 SECTION 1: GRAPHICAL AND TABULAR DESCRIPTIVE
TECHNIQUES
MULTIPLE CHOICE
1. The classification of student major (accounting, economics, management, marketing, other) is an
example of a(n)
a. nominal random variabl

Chapter 7
7.1 a 0, 1, 2,
b Yes, we can identify the first value (0), the second (1), and so on.
c It is finite, because the number of cars is finite.
d The variable is discrete because it is countable.
7.2 a any value between 0 and several hundred miles

Practice problems for Exam 1
1._ You take a random sample of 100 students at your university and find that their average
GPA is 3.1. If you use this information to help you estimate the average GPA for all students at
your university, then you are doing w

Business 500C
Quantitative and Statistical Analysis
Zixuan Su
WEEK 3
Homework Assignment:
Chapter 5
Pg.162.Exercise 5.1, 5.2, 5.5.
Pg.169.Exercise 5.13,
5.16.
Pg.171.Exercise 5.19.
5.1 Observational data is collected by the simplest direct way. A statisti

Business 500C
Quantitative and Statistical Analysis
Zixuan Su
11829465
Week 1
Homework Assignment:
Chapt. 1 pg. 9: 1.1, 1.2, 1.3, 1.4, 1.5, 1.7, 1.8.
Chapt. 2 pg. 41 42: Chapter Exercises: 2.50, 2.51(Use an
MS Excel spreadsheet to analyze this data and se

Chapter 9
9.1a. 1/6
b. 1/6
9.2 a P( X = 1) =P(1,1)= 1/36
b P( X = 6) = P(6,6) = 1/36
9.3a P( X = 1) = (1/6) 5 = .0001286
b P( X = 6) = (1/6) 5 = .0001286
9.4 The variance of X is smaller than the variance of X.
9.5 The sampling distribution of the mean is

CHOSUN UNIVERSITY SEOK-GANG.PARK
CHAPTER 3 SECTION 1-2: ART AND SCIENCE OF GRAPHICAL
PRESENTATIONS
MULTIPLE CHOICE
1. The effect of making the slope of a line chart appear steeper can be created by:
a. Stretching the vertical axis.
b. Shrinking the horizo

CHOSUN UNIVERSITY SEOK-GANG,PARK
CHAPTER 4 SECTION 1: NUMERICAL DESCRIPTIVE TECHNIQUES
MULTIPLE CHOICE
1. Which of the following statistics is a measure of central location?
a. The mean
b. The median
c. The mode
d. All of these choices are true.
ANS: D
PT

Name: _ Class: _ Date: _
Econ205_Midterm1_A
Multiple Choice
Identify the choice that best completes the statement or answers the question.
_
1. Which of the following represents a graphical presentation of interval data?
a. A bar chart.
b. A histogram.
c.

Quantitative and Statistical Analysis
Jiao Fall 2013
Prof. Peiran
Homework 1
This homework is due on Sept 11 in class. Please submit a hard copy.
To answer these questions, you dont need to copy and paste the dataset in your answer. Just
include the graph

Chapter 2
2.1 Nominal: Occupation, undergraduate major. Ordinal: Rating of university professor, Taste test
ratings. Interval: age, income
2.2 a Interval
b Interval
c Nominal
d Ordinal
2.3 a Interval
b Nominal
c Ordinal
d Interval
e Interval
2.4 a Nominal

AnswerKeytoHW2
PartI
FTFFFTFTF
PartII
BDACDBBC
1.
PartIII
The number of hours a college student spent studying during the final exam week was
recorded as follows: 7, 6, 4, 9, 8, 5, and 10. Compute s2 in two ways, and compute s for
the data and express the

QuantitativeandStatisticalAnalysis
JiaoFall2013
Prof.Peiran
Homework2
ThishomeworkisdueonSept18inclass.Pleasesubmitahardcopy.
PartI.TrueorFalse
1. A data sample has a mean of 107, a median of 122, and a mode of 134. The distribution of the
data is positiv

Statistics
Prof. Peiran Jiao
Homework 3
Due Wednesday Oct 9 in class.
Part I. True or False
Write your answers here:
1.
P(A) + P(B) = 1 for any events A and B that are mutually exclusive.
2.
The mean of a discrete probability distribution for X is the sum

Statistics
Prof. Peiran Jiao
Homework 4
This homework is due on Wednesday, Oct 16 in class.
Part I. True or False
Write your answers here:
1.
Since there is an infinite number of values a continuous random variable can assume, the
probability of each indi

Statistics
Prof. Peiran Jiao
Homework 4
Part I. True or False
Write your answers here:
1.
Since there is an infinite number of values a continuous random variable can assume, the
probability of each individual value is virtually 0.
ANS: T
2.
A continuous

Chapter 10
10.1 A point estimator is a single value; an interval estimator is a range of values.
10.2 An unbiased estimator of a parameter is an estimator whose expected value equals the
parameter.
10.3
10.4
10.5 An unbiased estimator is consistent if the

CHOSUN UNIVERSITY-SEOK-GANG,PARK
CHAPTER 1 SECTION 1: WHAT IS STATISTICS?
MULTIPLE CHOICE
1. You take a random sample of 100 students at your university and find that their average GPA is 3.1. If
you use this information to help you estimate the average G