STAT 420
Homework #2
(10 points) (due Friday, September 12, by 3:00 p.m.)
Fall 2008
1.
The friendly folks at the Internal Revenue Service (IRS) are always looking for ways to improve the wording and format of its tax return forms. Three new forms have bee
STAT 420
Homework #4
(10 points) (due Friday, September 26, by 3:00 p.m.)
Fall 2008
1.
Hogg and Ledolter report on an engineer in a textile mill who studies the effects of temperature and time in a process involving dye on the brightness of a synthetic fa
STAT 420
(due Friday, October 24, by 3:00 p.m.) From the textbook:
Homework #8
Fall 2008
6.7
(a), (b)
_
2.
The dataset prostate comes from a study on 97 men with prostate cancer
who were due to receive a radical prostatectomy. ( Andrews D. F. and Herzberg
STAT 420
(10 points) (due Friday, November 7, by 3:00 p.m.)
Homework #10
Fall 2008
1.
Can a corporation's annual profit be predicted from information about the company's chief executive officer (CEO)? Forbes (May, 1999) presented data on company profit
(
STAT 420
(10 points) (due Friday, November 14, by 3:00 p.m.)
Homework #11
Fall 2008
1.
A forester seeking information on basic tree dimensions obtains the following measurements of the diameters 4.5 feet above the ground and the heights of 12 sugar maple
STAT 420
(10 points) (due Friday, November 7, by 3:00 p.m.)
Homework #10
Fall 2008
1.
Can a corporation's annual profit be predicted from information about the company's chief executive officer (CEO)? Forbes (May, 1999) presented data on company profit
(
STAT 420
(due Friday, October 31, by 3:00 p.m.) From the textbook:
Homework #9
Fall 2008
1.
5.12
n
(d)
x
1.0 = 5. 1.2 1.4 1.6 1.8 2.0
Recall Homework 4:
y
3.4 7.0 6.0 9.0 8.0 11.0
^ y =5x
5 6 7 8 9 10
^ e=y y
1.6 1.0 1.0 1.0 1.0 1.0
^ = i =1 n
xi yi xi 2
STAT 420
(10 points) (due Friday, November 14, by 3:00 p.m.)
Homework #11
Fall 2008
1.
A forester seeking information on basic tree dimensions obtains the following measurements of the diameters 4.5 feet above the ground and the heights of 12 sugar maple
STAT 420
(10 points) (due Friday, November 21, by 3:00 p.m.)
Homework #12
Fall 2008
1.
Chemists often use ion-sensitive electrodes (ISEs)to measure the ion concentration of aqueous solutions. These devices measure the migration of the charge of these ions
STAT 420
Homework #12
ppm 0 0 0 50 50 50 75 75 75 100 100 100 150 150 150 200 200 200
Fall 2008
1.
Chemists often use ion-sensitive electrodes (ISEs)to measure the ion concentration of aqueous solutions. These devices measure the migration of the charge o
STAT 420
Homework #13
(10 points) (due Wednesday, December 10, by 3:00 p.m.)
Fall 2008
1.
a)
We will use the R time series functions to simulate, plot, and calculate sample ACF and PACF. To generate the AR(1) model: Yt = 1 Yt 1 + et
where et are N(0, 1) r
William Gosset
(1876-1937)
The
t Distribution
EXCEL: = TINV ( , v ) = TDIST ( t , v , 1 ) = TDIST ( t , v , 2 ) gives gives gives
t
2
for t distribution with v degrees of freedom the upper tail probability for t distribution with v degrees of freedom, P (
STAT 420
Fall 2016
Name
Version A
Page
ANSWERS
NetID _
Exam 2
Earned
Be sure to show all your work; your
partial credit might depend on it.
1
2
No credit will be given
without supporting work.
3
Place your answers
in the space provided.
4
The exam is clos
STAT 420
(due Friday, October 31, by 3:00 p.m.) From the textbook:
Homework #9
Fall 2008
1.
5.12
n
(d)
x
1.0 = 5. 1.2 1.4 1.6 1.8 2.0
Recall Homework 4:
y
3.4 7.0 6.0 9.0 8.0 11.0
^ y =5x
5 6 7 8 9 10
^ e=y y
1.6 1.0 1.0 1.0 1.0 1.0
^ = i =1 n
xi yi xi 2
STAT 420 Fall 2008 Version B
Name
ANSWERS
.
Exam 1
Possible 5 11 10 9 10 7 12 6 10 80 The exam is closed book and closed notes. You are allowed to use a calculator and one 8" x 11" sheet with notes on it. Earned
Page 1 2 3 4 5 6 7 8 9 Total
Be sure to sho
STAT 420 Fall 2008 Version A
Name
ANSWERS
.
Exam 2
Possible 10 11 14 4 9 10 13 9 80 The exam is closed book and closed notes. You are allowed to use a calculator and one 8" x 11" sheet with notes on it. Earned
Page 1 2 3 4 5 6 7 8 Total
Be sure to show al
STAT 420 Fall 2008 Version B
Name
ANSWERS
.
Exam 2
Possible 9 10 13 10 11 14 4 9 80 The exam is closed book and closed notes. You are allowed to use a calculator and one 8" x 11" sheet with notes on it. Earned
Page 1 2 3 4 5 6 7 8 Total
Be sure to show al
STAT 420
(10 points) (due Friday, September 5, by 3:00 p.m.) From the textbook:
Homework #1
Fall 2008
3.5
The salary of junior executives in a large retailing firm is normally distributed with standard deviation = $1,500. If a random sample of 25 junior e
STAT 420
(10 points) (due Friday, September 5, by 3:00 p.m.) From the textbook:
Homework #1
Fall 2008
3.5
The salary of junior executives in a large retailing firm is normally distributed with standard deviation = $1,500. If a random sample of 25 junior e
STAT 420
Homework #2
(10 points) (due Friday, September 12, by 3:00 p.m.)
Fall 2008
1.
The friendly folks at the Internal Revenue Service (IRS) are always looking for ways to improve the wording and format of its tax return forms. Three new forms have bee
STAT 420
(10 points) (due Friday, September 19, by 3:00 p.m.)
Homework #3
Fall 2008
1.
Use Packages > Install Package(s). to download and install package (library) faraway. Use the infmort data set where Y is income and the grouping variable is region (As
STAT 420
(10 points) (due Friday, September 19, by 3:00 p.m.)
Homework #3
Fall 2008
1.
Use Packages > Install Package(s). to download and install package (library) faraway. Use the infmort data set where Y is income and the grouping variable is region (As
STAT 420
Homework #4
(10 points) (due Friday, September 26, by 3:00 p.m.)
Fall 2008
1.
Hogg and Ledolter report on an engineer in a textile mill who studies the effects of temperature and time in a process involving dye on the brightness of a synthetic fa
STAT 420
(due Friday, October 3, by 3:00 p.m.)
Homework #5
Fall 2008
Do NOT use a computer for this homework assignment.
Be sure to show all your work, your partial credit might depend on it.
No credit will be given without supporting work.
1.
An employee
STAT 420
(due Friday, October 3, by 3:00 p.m.)
Homework #5
Fall 2008
1.
An employee claims that drinking beer has no effect on the amount of time it takes for him to perform a particular task. The following data show how many seconds he took to perform th
STAT 420
(due Friday, October 10, by 3:00 p.m.) From the textbook:
Homework #6
Fall 2008
5.6
5.8
5.19
4.
Suppose that company A and company B are in the same industry sector, and the prices of their stocks, $X per share for company A and $Y per share for