Homework 1
Due next Tuesday, January 25
People from IEN/MAS311 may skip this homework assignment.
Problem #1: 8.1
Problem #2: 8.19
Problem #3: 8.26
Problem #4: A noodle machine in Spumoni's spaghetti factory makes about 5 percent defective
noodles when pr

Homework 7
(3/29/2011)
Due next Thursday
#1: Exercise 12.2 and Exercise 12.17
Examine the normal probability plot and the residual versus fit plot. How about adding one
additional random variable, called x1*x2 and test the following model:
Y = 0 + 2 x 2 +

Let X1 , . . . , Xn be a collection of random variables from a normal distribution with unknown mean
and unknown variance 2 . Show that
(n1)S 2
2
=
n
i=1 (Xi
X )2 / 2 follows a chi-square distri-
bution with degrees of freedom n-1.
I am presenting two p

Review Materials for Exam 1
Exam Rules:
1. Try NOT to sit close to your friends in the classroom;
2. You can use a calculator, but you cannot use any advanced functions such as
integration functions;
3. You can bring a half-page cheat sheet (half page of

Review Materials for Exam 2
Exam date: Thursday, March 31.
Exam Rules:
1. Try NOT to sit close to your friends in the classroom;
2. You can use a calculator, but you cannot use any advanced functions such as
integration functions;
3. You can bring a one p

IEN 312
Feb. 15, 2011
Quiz 1
Name:
Eight independent measurements are taken of the diameter of a piston. The measurements (in inches) are:
3.236, 3.223, 3.242, 3.244, 3.228, 3.253, 3.253, 3.230
The sample mean is 3.238625 and the sample standard deviation

IEN 312
Feb. 15, 2011
Quiz 1
Name:
Eight independent measurements are taken of the diameter of a piston. The measurements (in inches) are:
3.236, 3.223, 3.242, 3.244, 3.228, 3.253, 3.253, 3.230
The sample mean is 3.238625 and the sample standard deviation

Quiz 3
Name:
Observations of the yield of a chemical reaction taken at various temperatures were recorded as
follows:
x (oC)
y (%)
77.4
84.1
88.9
94.8
150
200
250
300
76.7
84.5
89.2
94.7
Sample variance
0.5633
0.1600
0.1633
0.4433
78.2
83.7
89.7
95.9
Esti

IEN 312: Applied Statistical Methods
Sections P and P1, Spring Semester 2011
Tuesday and Thursday, 11:00am-12:15pm, MM 212
_
Course Description
This course is an introduction to engineering statistics and its applications. The topics covered
include: para

11.41
Regression Analysis: Course Grade versus Placement Test
The regression equation is
Course Grade = 32.5 + 0.471 Placement Test
Predictor
Constant
Placement Test
S = 16.1747
Coef
32.51
0.4711
SE Coef
12.64
0.2182
R-Sq = 20.6%
T
2.57
2.16
P
0.019
0.045

Reading assignment: Sections 9.4, 9.5
Homework 2
Due next Tuesday (2/1/2010)
#1 (Modified from Exercise 9.6)
The heights of a random sample of 50 college students showed a sample mean of 174.5
centimeters. Assume that the heights approximately follow a no

Reading assignment: Sections 9.4, 9.5
Homework 2
Due next Tuesday (2/1/2010)
#1 (Modified from Exercise 9.6)
The heights of a random sample of 50 college students showed a sample mean of 174.5
centimeters. Assume that the heights approximately follow a no

Homework 3
Due next Thursday (2/10/2010)
#1 A soft-drink manufacturer purchases aluminum cans from an outside vendor. A random
sample of 70 cans is selected from a large shipment, and each is tested for strength by applying
an increasing load to the side

Homework 3
Due next Thursday (2/10/2010)
#1 A soft-drink manufacturer purchases aluminum cans from an outside vendor. A random
sample of 70 cans is selected from a large shipment, and each is tested for strength by applying
an increasing load to the side

Homework 4: Reading 10.13, 11.1-11.4
Due next Thursday (2/17/2011)
2
#1: Exercise 10.71. The null hypothesis is H 0 : = 1.15 and the alternative hypothesis is
H 1 : 2 > 1.15 . This is a one-sided test and we can compare the chi-square statistic with a
thr

Homework 4: Reading 10.13, 11.1-11.4
#1:
Use the 2 statistic. 2 0.05, 24 = 36.415 . The critical region is (36.415, )
2
Computation: =
( 24) ( 2.03)
1.15
= 42.365 .
At =0.05 level, we reject the null hypothesis and conclude that the soft drink machine is

Homework 5: Reading assignment sections 11.5, 11.6, 11.7
Due next Tuesday (3/1/2011)
Refer to the same data set we studied in homework 4.
A study was made on the amount of converted sugar in a certain process at various
temperatures. The data were coded a

Homework 5: Reading assignment sections 11.5, 11.6, 11.7
Due next Tuesday (3/1/2011)
Refer to the same data set we studied in homework 4.
A study was made on the amount of converted sugar in a certain process at various
temperatures. The data were coded a

Minitab Project 1
Question 1:
Cases 12Pk
The outliers are the last five columns and also the case 600 in the histogram.
Case 1200 does not have any frequency
Case 18PK
In this when we analyze the histogram we see that it is similar to the other one. The l