Question
An instructor has given a short quiz consisting of two parts. For a randomly selected student,...
An instructor has given a short quiz consisting of two parts. For a randomly selected student, let X = the number of points earned on the first part and Y = the number of points earned on the second part. Suppose that the joint pmf of X and Y is given in the accompanying table.
| y | |||||
|
p(x, y) |
0 | 5 | 10 | 15 | |
| x | 0 | 0.03 | 0.06 | 0.02 | 0.10 |
| 5 | 0.04 | 0.16 | 0.20 | 0.10 | |
| 10 | 0.01 | 0.15 | 0.12 | 0.01 | |
(a) Compute the covariance for X and Y. (Round
your answer to two decimal places.)
Cov(X, Y) =
(b) Compute ρ for X and Y. (Round your
answer to two decimal places.)
ρ =
Homework Answers
Answer #1
Not the answer you're looking for?
Similar Questions
An instructor has given a short quiz consisting of two parts. For a randomly selected student,...
An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X = the number of points
earned on the first part and Y = the number of points earned on the
second part. Suppose that the joint pmf of X and Y is given in the
accompanying table. y p(x, y) 0 5 10 15 x 0 0.03 0.06 0.02 0.10 5
0.04 0.14 0.20 0.10 10 0.01 0.15 0.14 0.01 (a) Compute...
An instructor has given a short quiz consisting of two parts. For a randomly selected student,...
An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X = the number of
points earned on the first part and Y = the number of
points earned on the second part. Suppose that the joint pmf of
X and Y is given in the accompanying table.
y
p(x, y)
0
5
10
15
x
0
0.03
0.06
0.02
0.10
5
0.04
0.15
0.20
0.10
10
0.01
0.15
0.13
0.01
(a)...
An instructor has given a short quiz consisting of two parts. For a randomly selected student,...
An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X = the number of
points earned on the first part and Y = the number of
points earned on the second part. Suppose that the joint pmf of
X and Y is given in the accompanying table.
y
p(x,
y)
0
5
10
15
x
0
0.03
0.06
0.02
0.10
5
0.04
0.17
0.20
0.10
10
0.01
0.15
0.11
0.01
(a)...
An instructor has given a short quiz consisting of two parts. For a randomly selected student,...
An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X = the number of
points earned on the first part and Y = the number of
points earned on the second part. Suppose that the joint pmf of
X and Y is given in the accompanying table.
y
p(x,
y)
0
5
10
15
x
0
0.01
0.06
0.02
0.10
5
0.04
0.14
0.20
0.10
10
0.01
0.15
0.16
0.01
(a)...
An instructor has given a short quiz consisting of two parts. For a randomly selected student,...
An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X = the number of
points earned on the first part and Y = the number of
points earned on the second part. Suppose that the joint pmf of
X and Y is given in the accompanying table.
y
p(x,
y)
0
5
10
15
x
0
0.03
0.06
0.02
0.10
5
0.04
0.15
0.20
0.10
10
0.01
0.15
0.13
0.01
(a)...
An instructor has given a short quiz consisting of two parts. For a randomly selected student,...
An instructor has given a short quiz consisting of two parts.
For a randomly selected student, let X represent the number of
points earned on the first part and let Y represent the number of
points earned on the second part. Suppose that the joint pmf of X
and Y is given in the table below. Y 0 5 10 15 0 0.11 0.07 0.05
0.12 X 5 0.07 0.14 0.09 0.07 10 0.06 0.10 0.04 0.08 (a) Calculate
P(X...
A certain market has both an express checkout line and a super-express checkout line. Let X1...
A certain market has both an express checkout line and a
super-express checkout line. Let X1 denote the
number of customers in line at the express checkout at a particular
time of day, and let X2 denote the number of
customers in line at the superexpress checkout at the same time.
Suppose the joint pmf of X1 and
X2 is as given in the accompanying table.
x2
0
1
2
3
x1
0
0.08
0.06
0.04
0.00
1
0.04
0.18...
A certain market has both an express checkout line and a super-express checkout line. Let X1...
A certain market has both an express checkout line and a
super-express checkout line. Let X1 denote the
number of customers in line at the express checkout at a particular
time of day, and let X2 denote the number of
customers in line at the superexpress checkout at the same time.
Suppose the joint pmf of X1 and
X2 is as given in the accompanying table.
x2
0
1
2
3
x1
0
0.08
0.06
0.04
0.00
1
0.07
0.13...
Consider the following bivariate distribution p(x, y) of two discrete random variables X and Y. Y\X...
Consider the following bivariate distribution p(x, y) of two
discrete random variables X and Y.
Y\X
-2
-1
0
1
2
0
0.01
0.02
0.03
0.10
0.10
1
0.05
0.10
0.05
0.07
0.20
2
0.10
0.05
0.03
0.05
0.04
a) Compute the marginal distributions p(x) and p(y)
b) The conditional distributions P(X = x | Y = 1)
c) Are these random variables independent?
d) Find E[XY]
e) Find Cov(X, Y) and Corr(X, Y)
A service station has both self-service and full-service islands. On each island, there is a single...
A service station has both self-service and full-service
islands. On each island, there is a single regular unleaded pump
with two hoses. Let X denote the number of hoses being
used on the self-service island at a particular time, and let
Y denote the number of hoses on the full-service island in
use at that time. The joint pmf of X and Y
appears in the accompanying tabulation.
y
p(x,
y)
0
1
2
x
0
0.10
0.03
0.01 ...
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 5 minutes ago
asked 34 minutes ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago