Laura Hess March 12, 2008 Math-006-02 Professor Stein Graded Homework 3 Problem 3.14 a.
Group 1 (10 young adult men) treatment 1 (potent cigarettes) random allocation Group 2 (10 young adult men) treatment 2 (weak cigarettes) Compare work output ea
COMPARING SEVERAL
MEANS: ANOVA
Chapter 10
Slide 2
Aims
Understand the basic principles of ANOVA
Why it is done?
What it tells us?
Theory of one-way independent ANOVA
Following up an ANOVA:
Post Hoc Tests
Slide 3
When And Why
When we want to compare
Comparing Two Means
Chapter 9
Aims
T-tests
Dependent (aka paired, matched)
Independent
Rationale for the tests
Assumptions
Interpretation
Reporting results
Calculating an Effect Size
T-test
Dependent t-test
Compares two means based on related da
The Beast of Bias
Slide 2
Aims
Assumptions of parametric tests based on the normal distribution
Understand the assumption of normality
Graphical displays
Skew
Kurtosis
Normality tests
Understand Homogeneity of Variance
Levenes Test
Know how to correct
Multiple Regression
Chapter 8
Understand When To Use Multiple
Regression
Understand the multiple
regression equation and what the
betas represent
Understand Different Methods of
Regression
Hierarchical
Stepwise
Forced Entry
Aims
Understand How to d
Linear Regression
Chapter 8
Slide 2
Aims
Understand linear regression with one predictor
Understand how we assess the fit of a regression model
Total Sum of Squares
Model Sum of Squares
Residual Sum of Squares
F
R2
Learn how to do Regression in SPS
Correlation
Chapter 6
Aims
Measuring Relationships
Scatter plots
Covariance
Pearsons Correlation Coefficient
Nonparametric measures
Spearmans Rho
Kendalls Tau
Interpreting Correlations
Causality
Partial Correlations
What is a Correlation?
It is
Exploring Data with Graphs
Chapter 4
Aims
How to present data clearly
The Chart Builder
Graphs
Histograms
Boxplots
Error bar charts
Scatterplots
The Art of Presenting Data
Graphs should (Tufte, 2001):
Show the data.
Induce the reader to think ab
Everything You Ever wanted To Know
About Statistics
Chapter 2
Slide 2
Aims and Objectives
Samples and populations
Know what a statistical model is and why we use them.
The Mean
Know what the fit of a model is and why it is
important.
The Standard Dev
Why do we need statistics?
Chapter 1
Why do we need statistics
To be able to effectively answer business questions
Without the use of statistics it would be very difficult to make decisions
based on data. If we were interested in the differences between
Maura Woods Stats Homework #6 April 20, 2008 7.20 a. What are the degrees of freedom? n-1=15-1=14 Degrees of freedom = 14 b. Give two critical values t* from Table D that bracket t. t is between t*=2.145 (p= .025) and t*=2.264 (p=.02) c. What arte th