STAT 420
Spring 2008
Version A
Name ANSWERS
.
Exam 2
Page
Possible
Earned
1
4
2
10
3
13
4
16
5
9
6
8
Total
60
Be sure to show all your work; your
partial credit might depend on it.
No credit will be given
without supporting work.
The exam is closed book and closed
notes.
You are allowed to use a calculator and
one 8½" x 11" sheet with notes on it.
_________________________________________________________________________
Academic Integrity
The University statement on your obligation to maintain academic integrity is:
If you engage in an act of academic dishonesty, you become liable to severe disciplinary action. Such acts include
cheating; falsification or invention of information or citation in an academic endeavor; helping or attempting to help
others commit academic infractions; plagiarism; offering bribes, favors, or threats; academic interference; computer
related infractions; and failure to comply with research regulations.
Rule 33 of the Code of Policies and Regulations Applying to All Students gives complete details of rules governing
academic integrity for all students. You are responsible for knowing and abiding by these rules.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
1.
Consider the population of high school graduates who were admitted to a particular
university during a tenyear time period and who completed at least the first year
of coursework after being admitted. We are interested in investigating how well Y,
the first year grade point average (GPA), can be predicted by using the following
quantities with
n
= 20 students:
X
1
= the score on the mathematics part of the SAT (SATmath)
X
2
= the score on the verbal part of the SAT (SATverbal)
X
3
= the grade point average of all high school mathematics courses
(HSmath)
X
4
= the grade point average of all high school English courses (HSenglish)
Consider the model of the form:
Y
i
=
β
0
+
β
1
X
i
1
+
β
2
X
i
2
+
β
3
X
i
3
+
β
4
X
i
4
+
ε
i
,
i
= 1, 2, … , 20,
where
ε
i
’s are independent
N
(
0
,
σ
2
)
random variables.
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '08
 STEPANOV
 Statistics, Null hypothesis, Statistical hypothesis testing, SATmath, X1 X2 X3

Click to edit the document details