Question 10: (a) The scatter plot of brain weight versu body weight. From the scatter plot, we can hardly see any obvious relationshop between them.
6000 0 0 Brain_weight 2000 4000
(b) The scatter plot of log(brain weight)
Design Of Experiments ISYE 6413
HW 2: due February 9
1. (Chapter 2, #10) What do you learn from the plot (given in book)? How do you modify your
model and analysis?
The plot shows residuals, r_i, vs x_i, the different machines. We look for a p
Design of Experiments
1. (3)Give examples of hard-to-change factors. How do you reconcile the hard-to-change nature of the
factor with the need for randomization?
Hard-to-change factors are those that are not easily adjusted due to time o
DOE HW 3
Due: February 18, 2016
Will do multiple comparison with t-statistics from first table using Tukey method, but we will use
new table mean squared error.
is the null hypothesis, that the factors are the same.
Significant difference b
DOE HW 4
32. The ANOVA analysis ignores potential effect of initial pressure, where the ANCOVA although
it cannot control the effect, it can measure it.
At a level of alpha = 0.05, there is not a significant difference between substance
DOE HW 5
Due: Thursday, March 17
1. Chapter 4 #17:
a. Which main effects are significant for crack length? Are there significant interactions?
Above are the main effect factors as well as the interaction effects for y.
ME(A) = z (A+) z(A-)