C
HAPTER
4
1. For a constant
c
and a random variable
X
, what is the mean of
X
+
c
?
(a)
c
(b)
E[
X
]+
c
(c)
E[
X
]
(d)
c
E[
X
]
2. For two independent random variables
X
and
Y
, what is the mean of
X
+
Y
?
(a)
0
(b)
E[
X
]+E[
Y
]
(c)
E[
X
]E[
Y
]
(d)
None of the above.
3. For two correlated random variables
X
and
Y
, what is the mean of
X
+
Y
?
(c)
E[
X
]E[
Y
]
(d)
None of the above.
4. For two independent random variables
X
and
Y
, what is the variance of
X
+
Y
?
5. For two correlated random variables
X
and
Y
, what is the variance of
X
+
Y
?
6. The total area under the pdf curve is
(a)
1
(b)
0
(c)
depends on the nature of the pdf
(d)
none of the above
7. The spectral density of white noise
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '08
 PingLi
 Probability theory, independent random variables, correlated random variables

Click to edit the document details