DO NOW
Misleading Graphs: Can you see what is wrong with each of
them? Make a list of their faults.
DIRECT INSTRUCTION
There is absolutely no talking while I am
speaking
Use the slides to fill out your graphic
organizer.
Write down notes and examples in the
Cornell Notes Format
Absolutely no talking during DI. After the
first warning you will receive Tuesday
Lunch Recentering
CORNELL NOTES
CHAPTER 2
STATS IN YOUR WORLD
I N T RO D U C T I O N TO
STAT I ST I C S
WHAT IS STATISTICS?
Statistics is the study of the collection, organization,
analysis, interpretation, and presentation of data.
 It deals with all aspects of this, including the
planning of data collection in terms of the design
of surveys and experiments.
DATA
Values of qualitative or quantitative variables.
All data is not numerical
Data is useless without its proper context
To understand the context of data, you must
know the 5 W’s: Who, What, When, Where, Why.
WHO
Who - Who the data is about.
Surveys: Respondents
Experiment: Subjects or participants.
We refer to the who as a case.
What we call the case depends on the situation.
The who is not always a person!!!!!
Order
Name
Number
Ship To
Price
Area
Code
Gift
ASIN
Artist
10542
9
Mia
True
Ohio
12.99
301
Y
B00052K Beyonc
9
e
10642
1
Tom
Day
Florida
10.99
215
N
B00042C
7
Adele
For example, the who in this example are
the CD purchases.
Samples vs. Populations
In statistics, we
must note the
difference
between
samples and
populations.
POPULATION
"The term "population" is used in statistics
to represent all possible measurements
or outcomes that are of interest to us in
a particular study."
Sample
• "The term "sample" refers to a portion of
the population that is representative of
the population from which it was
selected."
EXAMPLE
In March 2007, Consumer reports published an
evaluation of large screen, high definition television
sets (HDTVs). The magazine purchased and tested 98
different models from a variety of manufacturers.
Question: What are the population of interest? The sample?
The who of this study?
THE POPULATION IS LARGE SCREEN HD TV’s
The sample are the 98 sets tested.
The who of the study is the 98 hd tv’S.
TRY THIS
Turn to page 9 in the textbook. Answers
numbers 1 – 3 of the Just Checking
Section.
(5mins)
1)
All mini cars
2)
4255 recently purchased mini cars.
3)
The mini cars purchased by the 4255 users.
(The OWNERS are not the who because we are interested in
making generalizations about the
cars NOT WHO PURCHASED
THEM)
WHAT
Variables – The characteristics recorded about
each individual.
There are two types of variables:
1. Quantitative
2. categorical
VARIABLES
QUANTITATIVE Variables
measure either how much or how many of something.
categorical variables
 name categories or answer questions about how cases fall.
To really understand a variable, you must Think about what
you want to know AND DO NOT .
For example: are area codes quantitative or categorical?
WHEN, WHERE, WHY
SELF EXPLANATORY!
CLASSWORK
P.11 and 12 (#4 - 6)
Answers:
4)To find out what buyers like about their cars (in order to
improve future cars).
5) a) categorical b)quantitative c)quantitative d) quantitative e)
categorical f)categorical
6) Who – tour de France, What – year, winner, country, time,
speef, stages, etc, Where – France, When – 1903 – 2009,
Why - ???
INDEPENDENT PRACTICE
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