ST 512-Practice Exam I - Osborne
Directions: Answer questions as directed. For true/false questions, circle either true or false. 1. A study was carried out to examine the relationship between the number of moths caught overnight in a light trap y and two
ST 512 Homework assignment #4
Dr. Jason A. Osborne
1. Obtain the residuals from a simple linear regression of bodyfat percentage
on midarm circumference (x2 ) using the dataset bodyfat.dat. Obtain a
plot of the empirical quantiles of the residuals (sorted
ST512
Summer Session II, 2008
Quiz 1
Name:
Directions: Answer questions as directed. Please show work. Give expressions for answers where possible, as partial credit may be awarded in cases where expressions are correct, but numerical answers are not.
You
ST512, Spring, 2010
Quiz 1 - solutions
1. (20 points) A random sample of n = 20 elements is drawn from a population of interest
and two attributes, denoted xi and yi are measured on each element i. Some summary
statistics are given below:
y = 19.3
x = 14.
ST512
Spring, 2010
Quiz 1
Name:
Directions:
Silence or turn o your cell phones.
Do not look at or begin the quiz until the entire class is given permission to do so.
When the end of the quiz is announced, you must stop writing or 10 points will be
dedu
ST512
Fall Semester, 2013
Quiz 1 Solutions
1. (24 pts) Short answers:
(a) A random sample of n = 19 bivariate observations yields a sample correlation coecient
of rxy = .5. Are X and Y plausibly independent? Use Fishers transformation at level
= .05.
1
z
Quiz 1, Spring 2009 - solutions 1. (30 points) Blood pressure increase with age in kids. A study measured diastolic blood pressure and age (in years, ranging between 5 and 13, with an average of x = 9.25) on a random sample of boys. Code and output for a
ST512
Spring, 2009
Quiz 1
Name:
Directions: Answer questions as directed. Please show work. Give expressions for answers
where possible, as partial credit may be awarded in cases where expressions are correct, but
numerical answers are not.
You may use th
ST512
Fall Semester, 2013
Quiz 1
Name:
Directions: Answer questions as directed. Show work. Partial credit may be awarded for correct
expressions given in incomplete answers.
You may use the back of the page if necessary. Please make some indication if yo
ST512
Fall Semester, 2008
Quiz 1- solution
1. In NFL games from a sample of n = 682 games, two measurements are made: the
published point spread x and margin of victory y for the favored team. A simple linear
regression of y on x was t with SAS. Code and
ST512
Fall Semester, 2008
Quiz 1
Name:
Directions: Answer questions as directed. Please show work. Partial credit may be awarded
for correct expressions given in incomplete answers. To save time, it is ok to give answers as
numeric expressions without car
ST 512-Practice Exam I - Osborne
Directions: Answer questions as directed. For true/false questions, circle either true or false. 1. SS[E]3 R(1 |0 ) R(2 |0 , 1 ) R(1 |0 , 2 ) = = = = 2.365 0.305 (SS[R] for simple linear regression of y on x1 ) 0.488 0.595
ST512-R
Homework #10
1. (Taken from Rao 16.8, p. 765) An experiment evaluates the taste of three brands
of ice cream under dierent storage conditions. The expt. calls for 12 coolers to be
randomized to the 3 brands (4 coolers per brand). Within each coole
5-point bonus questions preceding quiz 2, ST512 - Osborne These problems are not required. To receive credit, you must work independently. 1. Consider a multiple linear regression involving a sample of n = 112 NFL football games from the latter half of th
Rough Table of Contents for notes that accompany the lectures
Topic
Pages
Simple linear regression (SLR) - heights example
1-9
Simple linear regression
10
Correlation
12-20
Probability Model for SLR
21
Multiple linear regression
33
Matrix formulation for
ST 512 Homework assignment #7
Dr. Jason A. Osborne
1. Consider the data from exercise 13.31 (p. 632).
(See the code entitled sleep.sas). Note that while the means for all
t = abc = 12 treatment combinations are given, the triplicate (n = 3)
observations a
ST512, Summer Session II, 2008 Quiz 1 - solutions 1. (20 points) Four scatterplots appear below. (a) For each sample correlation coecient, circle the letter of the corresponding plot (one letter per correlation coecient). r r r r = 0.58 (A B C D) = 0.95 (
ST512
Fall Semester, 2008
Quiz 2
Name:
Directions: Answer questions as directed. Please show work. Partial credit may be awarded
for correct expressions given in incomplete answers. To save time, it is ok to give answers as
numeric expressions without car
ST512
Spring, 2010
Quiz 2
Name:
Directions:
Please silence or turn o your cell phones.
Do not look at or begin the quiz until the entire class is given permission to do so.
When the end of the quiz is announced, you must stop writing or 10 points will
ST512
Fall Semester, 2006
Quiz 4
Name:
Directions: Answer questions as directed. Please show work. You do not need to carry out any arithmetic that is obvious for the grader. For example, if the correct answer is 62.1 + 2.6 + 28.1 + 30.3, then you needn't
ST512 handout Modelling factorial effects: fixed, or random? Random Fixed Levels - selected from conceptually popn of collection of levels - finite number of possible levels Another expt - would use same levels - would involve new levels sampled from same
ST512
Fall Semester, 2006
Quiz 4
Name:
Directions: Answer questions as directed. Please show work. You do not need to carry out any arithmetic that is obvious for the grader. For example, if the correct answer is 62.1 + 2.6 + 28.1 + 30.3, then you needn't
ST512
Fall Semester, 2006
Quiz 4
Name:
Directions: Answer questions as directed. Please show work.
There are 4 problems, worth 25 points each, on 5 pages. After the problems, there are three pages of SAS output pertaining to problems 1, 2 and 3 (WHEAT PRO
ST512
Summer Session II, 2008
Quiz 3-solutions
1. An industrial engineer investigates the eect of three dierent types of computer mouse
on repetitive motion disorders (RMD). She is able to recruit N = 12 subjects, sampled
from a population of interest, an
ST512
Summer Session II, 2008
Quiz 3
Due date to be determined
Name:
Directions: Please work independently. Answer questions as directed. Please show work. Give expressions for answers where possible, as partial credit may be awarded in cases where expres
ST512
Spring, 2009
Quiz 3
Name:
Directions: Answer questions as directed. Please show work. Give expressions for answers
where possible, as partial credit may be awarded in cases where expressions are correct, but
numerical answers are not.
You may use th
ST512 Fall Semester, 2006 Quiz 3-solutions 1. (Taken from Ott and Longnecker, Ch. 17) An experiment measures tablet hardness by randomly selecting three batches of a formulation for a drug, then randomly selecting three 1-kg samples from each of these bat
ST512
Fall Semester, 2006
Quiz 3
Name:
Directions: Answer questions as directed. Please show work. You do not need to carry out any arithmetic that is obvious for the grader. For example, if the correct answer is 62.1 + 2.6 + 28.1 + 30.3, then you neednt