George Washington Carver School Of Arts And Scienc
STAT 1053

Spring 2013
Descriptive Statistics
Numerical Summary
Summation Notation
Observations in a dataset are denoted by
cfw_ x1,x2,x3,x4,.xn ; n = sample size
x1 is the first observation, x2 is 2nd obs. and so
on.
We use xi to denote x1 + x2 + x3 + x4 +.+ xn
In particula
George Washington Carver School Of Arts And Scienc
STAT 1053

Spring 2013
Mean and Variance
Numerical Summary
Comparing Mean, Median and Mode
For negatively (left) skewed distributions
Mean < Median < Mode
Mean
Mode
Median
Intro STAT: Dr. Subrata Kundu
2
Skewed Right
For positively skewed distributions
Mean > Median > Mode
Mode
George Washington Carver School Of Arts And Scienc
STAT 1053

Spring 2013
Comparing Mean, Median and Mode
For negatively (left) skewed distributions
Mean < Median < Mode
Mean
Mode
Median
1
Skewed Right
For positively skewed distributions
Mean > Median > Mode
Mode
Mean
Median
2
Symmetric Distribution
For symmetric (not skewed) d
George Washington Carver School Of Arts And Scienc
STAT 1053

Spring 2013
Chapter 2
Descriptive Statistics
Contents
Qualitative Data
Frequency Distribution
Graphical Methods
Quantitative Data
Graphical Methods
Numerical Summary
Box Plot
Intro STAT  Dr. Subrata Kundu  GWU2
Qualitative Data
Measurements that cannot be mea
George Washington Carver School Of Arts And Scienc
STAT 1053

Spring 2013
Descriptive Statistics
Numerical Summary
Summation Notation
Observations in a dataset are denoted by
cfw_ x1,x2,x3,x4,.xn ; n = sample size
x1 is the first observation, x2 is 2nd obs. and so
on.
We use xi to denote x1 + x2 + x3 + x4 +.+ xn
In particula
George Washington Carver School Of Arts And Scienc
STAT 1053

Spring 2013
Chapter 1
Introduction
Contents
What is Statistics?
Applications
Fundamental Elements
Types of Data
Data Collection
Common Sources of Error
Intro STAT  Subrata Kundu  GWU
2
What is Statistics?
Statistics is the Science of Data
It involves collec
George Washington Carver School Of Arts And Scienc
STAT 1053

Spring 2013
Introduction
Structure
23 Lectures every week.
A Total of 11 lectures.
The topics to be covered in a week will be
posted on BlackBoard.
Weekly Quizzes
Comprehensive Final
Intro STAT  Subrata Kundu  GWU
2
Homework
HW will be assigned in every sess