(Your biggest thrill at Stanford) Course Objectives You will be prepared for more advanced courses...
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Transcript of (Your biggest thrill at Stanford) Course Objectives You will be prepared for more advanced courses...
(Your biggest thrill at Stanford)
Course Objectives
• You will be prepared for more advanced courses in multiple regression and analysis of variance.
Course Objectives
• You will be prepared for more advanced courses in multiple regression and analysis of variance.
• We will help each other so that no one will fail.
Course Objectives
• You will be prepared for more advanced courses in multiple regression and analysis of variance.
• We will help each other so that no one will fail.
• You will fall in love with statistics.
http://www.stanford.edu/~hakuta/Statistics/Syllabus2002.htm
Population
The goal is to describe this as accurately as possible.
Population
Sample
You take a sample.
Population
Sample
X
µ
_
You describe the sample._
Population
SampleA XA
µ
_
SampleB XB
SampleE XE
SampleD XD
SampleC XC
_
_
_
_
The sample mean is just one of many possible sample means drawn from the population, and is rarely equal to the real population value.
30 40 50 60 70 80
30
40
50
60
70
80
MATH
RD
G
30 40 50 60 70 80
35
45
55
65
75
RDG
MA
TH
Y = 17.1853 + 0.665809X
R-Sq = 47.7 %
Regression Plot
Regression
1.0 1.5 2.0
30
40
50
60
70
80
SEX
RD
G
Xboys=53.75_
Xgirls=51.16_
How do we know if the difference between these means,of 53.75 - 51.16 = 2.59, is reliably different from zero?
GAUSS, Carl Friedrich 1777-1855
http://www.york.ac.uk/depts/maths/histstat/people/gauss_note.gif.gz
A demonstration.
Population
Please go to this url
http://star.cde.ca.gov/star2002/district_index.html
Population
Sample
X
µ
_
_
1. Pick a school district that is not a high school district and does not appear to be a “special” district, e.g., a charter school, HomeSmartKids of Knightsen, etc.; beyond that, try to pick one randomly from the list.
2. Report the following:
1. For noneconomically disadvantaged, Grade 2 and Grade 5 Reading Mean Scaled Score.
2. For economically disadvantaged, Grade 2 and Grade 5 Reading Mean Scaled Score.