Chapter 1
Drawing Statistical Conclusions
Statistical Sleuthing
Carefully examining data to answer
questions of interest (Ramsey and S!afer)
Estimating the unobservable things of
science
What is an
Alternatives to the t-Tools
Stat 511 Chapter 4
Case Study 1: O-Ring Failures
Observational study
Highly unbalanced
Far from normal
Apparently unequal standard
deviations and larger sample
is associate
CHAPTER 3
A Closer Look at Assumptions
1
!is is an advanced "apter.
Please ask questions#
CASE STUDY 1: CLOUD SEEDING
Cloud seeding to increase rainfall (randomized
experiment)
52 cumulus clouds
At ra
M arch 7, 2011
We can possibly resubmit exam the take home part. Due F riday.
Take Home Exam
General
If there is output but not verbiage then there is no points.
We have to wri te down. Less output is
M arch 3, 2011 Thursday
Regression
yi= 0+ 1xi+ i
i ~ N ( 0, 2)
Assumptions:
1.
2.
3.
4.
Normal distribution
Constant Variance
Independence
Correct Form
Fit X by Y /
F it polynomial / 2, quadratic
Firs
Feb 24 2011
Homework for Chapter 6 due Wednesday
Will do JMP today.
Chapter 5 summary
Dealt with the f-test, which as used for full and reduced model. ANOVA.
Anova addresses the question: are the mean
2 17 2011
Case Study 0502
Multiple means f-test ANOVA
Full model everything is there
Reduced model group things together that answer another question
FULL MODEL:
Separate Means model case 0502, seven
F or R IG H T NOW: non-parametr ic means ranks.
Chapter 5.
Concepts are similar but there are things to take advantage of, new questions
to ask, ad some new things to worry about.
Analysis of Variance
Comparisons Among Several
Samples
Stat 511 Chap 5
Stat 511 Chap 5
1
Purpose of this chapter
s
s
s
s
In the previous chapters we compared two groups
In chapter 5 we compare 3 or more groups.
Concepts a
Alternatives to the t-Tools
Stat 511 Chap 4
Stat 511 Chap 4
1
Case Study 1: O-Ring Failures
Stat 511 Chap 4
2
Case Study 1: O-Ring Failures
Stat 511 Chap 4
10
5
0
1
2
3
2
1
1
2
Count
15
3
Count
observ
A Closer Look at Assumptions
Stat 511 Chapter 3
Cloud Seeding Experiment
Case Study 1
Cloud seeding to increase rainfall
(randomized experiment)
52 cumulus clouds
At random 26 were seeded and 26 w
Inference Using t-Distributions
Chapter 2
511 Chap 2
1
Bumpus Data - Case Study I
Humerus length of adult sparrows in 1898
s 2 groups: perished, survived (after a storm)
s surviving sparrows were stre
Drawing Statistical
Conclusions
Chapter 1
Stat 511 Chap 1
1
Statistical Sleuthing
carefully examining data to answer questions
of interest (Ramsey and Schafer)
l estimating the unobservable things of