March 21, 2012
Homework Assignment #8 - Due March 28
1. A study was conducted to see how the basal metabolism rate (at rest) of growing boys is related to their age, height,
and weight. The age is given in months, the weight as [lo
Jan 25, 2012
Homework Assignment #1 - Due Feb 1
1. This problem is intended as an exercise in using the R language; thus, you will need to have access to a
computer. Please refer to the handout "An Introduction to the R Software".
Sign-up for Project Oral
Please sign up so that all members of your project team have their oral on the same day. (They do not have to
be sequential.) Also, for each day there is a different maximum number of groups tha
This is an example of subsampling in a one-way ANOVA model with 3 groups (treatments), 2 plots per group,
and 3 subsamples per plot.
This is the education example with students nested within teachers and independent variables available on
both teachers and students. This requires use of mixed models!
Start with some exponentially shaped data in test.
- the natural log of test
Geometry for Simple Linear Regression
Consider a straight-line regression model with 3 values for x: (1, 2, 3).
What is the model space associated with the model: Y = b0 + b1 x + e with these values for x ?
Sept. 4, 2015
Homework Assignment #1 - Due Sept 11
1. The statistical term mean is used in three different (but related) contexts: (i) sample mean - from a
particular sample; (ii) population mean; and (iii) random variable Y . Usin
We use the example of carrot lenghts. The universe is all carrots in a garden. (i)
Sample mean (from a particular sample) is the mean length of carrots in a sample-
-a portion of carrots in t
Sept 11, 2015
Homework Assignment #2 - Due Sept 18
1. Students in a marketing course were asked to provide an evaluation of their instructor before the final exam. (They
were told that the instructor would not see the evaluations u
Let ! , ! , ! denote the mean final exam score of rating groups excellent',good'
and `fair' respectively. We want to test:
! : ! = ! = ! v. s. ! : not all means are equal.
The complete ANOVA table is given
Case Study - Mammal Brain Size
A study by evolutionary biologists explored the relationships between brain size of mammals and potential penalties
associated with this such as longer pregnancies and fewer offspring. It
Description of Final Project
For your final project, you are to analyze a data set for which regression analysis is the primary means for analysis.
However, it is also important that the analysis provides answers to que
Project teams for Stat 333 (Spring 2012)
1. Oguz Akkas; Chunkeat Hiew; Jiaqi Lu
2. Brad Anderson; Jonghyun Lee; Jae Hwa Song
3. Mark Banghart; Dongho Jeon; Jong Min Lee
4. Alec Bollig; John Cagadas; Sean Drout (S)
5. D.J. Bywater; Sihan Hu; Chris Larson (
Clarification for Class Lecture on Feb 8
It was clear after class on Wed Feb 8 that there was some confusion following my presentation of estimation
and prediction error. A part of the confusion was due to a poor transi
Comparing Regression Lines (using snowfall examples)
Here is the regression output from our original snowfall example.
Estimate Std. Error t value Pr(>|t|)
Here is an example of a two-dimensional regression model without interaction. (Note, view this as a true model
w1 = 20 + 2 x y
Df Sum Sq Mean Sq F value Pr(>F)
1 48.050 48.050 8.2756 0.02