This preview shows page 1. Sign up to view the full content.
Unformatted text preview: STA 2023  Holbrook Intro Stats
Stats Starts Here
Chapter 1 11 What is Statistics?
STA 2023  Holbrook “Let us sit on this log at the roadside,” says I, “and forget the inhumanity
and ribaldry of the poets. It is in the glorious columns of ascertained facts
and legalized measures that beauty is to be found. In this very log we sit
upon, Mrs. Sampson,” says I, “is statistics more wonderful than any poem.
The rings show it was sixty years old. At the depth of two thousand feet it
would become coal in three thousand years. The deepest coal mine in the
world is at Killingworth, near Newcastle. A box four feet long, three feet
wide, and two feet eight inches deep will hold one ton of coal. If an artery
iis cut, compress it above the wound. A man’s leg contains thirty bones.
s
The Tower of London was burned in 1841.”
The
“Go on, Mr. Pratt,” says Mrs. Sampson. “Them ideas is so original
and soothing. I think statistics are just as lovely as they can be.”
O. Henry, The Handbook of Hymen
O.
The
12 What Is Statistics?
STA 2023  Holbrook 1. Collecting Data 2. e.g. Survey Data
Data
Analysis
Analysis Presenting Data 3. © 19841994 T/Maker Co. e.g., Charts & Tables DecisionMaking Characterizing Data 13 Why? e.g., Average © 19841994 T/Maker Co. Statistical Methods
STA 2023  Holbrook Statistical
Methods Descriptive
Statistics 14 Inferential
Statistics Descriptive Statistics
STA 2023  Holbrook 1. Involves 2. Purpose 15 Collecting Data
Presenting Data
Characterizing
Characterizing
Data
Data Describe Data 50 $ 25
0
Q1 Q2 Q3 Q4 Y = 30.5 S2 = 113 Inferential Statistics
STA 2023  Holbrook 1. Involves 2. Purpose 16 Estimation
Hypothesis
Hypothesis
Testing
Testing Make Decisions
Make
About Population
Characteristics
Characteristics Population? Descriptive vs. Inferential
STA 2023  Holbrook 1. Descriptive Statistics – Numerical
characteristics taken from a sample
used to describe a sample.
used
2. Inferential Statistics – Numerical
characteristics taken from a sample
used to make inferences about the
population.
population.
17 Key Terms
STA 2023  Holbrook 1. Population (Universe) All items of interest (i.e. people) 2. Sample Portion or subset of the Population 3. Statistic A numerical characteristic of a sample. 4. Parameter 18 A numerical characteristic of a population. STA 2023  Holbrook Relationship Between Statistics and Parameters 1. We use statistics (taken from a
We
sample) to estimate population
parameters (allowing us to make
inferences to the population).
inferences
2. WHY? Because of lack of resources
WHY?
(like time or money) to look at the
entire population.
entire
19 To put it another way….
STA 2023  Holbrook • Many statistics are used to draw
Many
conclusions about a population of
interest, on the basis of data collected
from a sample of cases from that
population.
population. 1  10
10 ...
View
Full
Document
This note was uploaded on 12/07/2011 for the course STA 2023 taught by Professor Staff during the Fall '11 term at Santa Fe College.
 Fall '11
 Staff
 Statistics

Click to edit the document details