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ISyE 2028A, Summer 2010
Friday July 23
Quiz 8 Solutions
1.
Which of the following statement is not true if
37
yx
=
−+
?
A.
The
y
intercept is 7
B.
y
decreases by 3 when
x
increases by 4
C.
y
decreases by 3 when
x
increases by 1
D.
The slope of the line is 3
ANSWER:
C
2.
The simple linear regression model is
01
,
Yx
ββ ε
=
++
where
ε
is a random variable assumed to be
normally distributed with
2
( )
0
and
( )
.
EV
εσ
=
=
Let
x
∗
denote a particular value of the
independent variable
x
.
Which of the following identities are true regarding the expected or mean
value of
Y
when
xx
∗
=
?
A.
x
µ
ββ
∗
∗
⋅
=
+
B.
()
x
∗
∗
⋅
=
+
C.
1
x
µβ
∗
∗
⋅
=
D.
0
∗
⋅
=
E.
0
∗
⋅
=
ANSWER:
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This note was uploaded on 09/02/2010 for the course ISYE 2028 taught by Professor Shim during the Summer '07 term at Georgia Tech.
 Summer '07
 SHIM

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