STAT 225 - Homework 2
Due Friday, September 10
Comments:
1. This homework is due Friday, September 10 in class, BEFORE class starts.
2. Please remember to STAPLE if you turn in more than one page.
3. You must always show all work. If you do not, you may n
STAT 225 - Homework 5
Due Friday, October 1
1. This homework is due Friday, October 1 in class, BEFORE class starts.
2. Please remember staple if you turn in more than one page.
3. You must always show all work. If you do not show your work, you may not r
STAT 225 - Homework 3
Due Friday, September 17
1. This homework is due Friday, September 17 in class, BEFORE class starts.
2. Please remember staple if you turn in more than one page.
3. You must always show all work. If you do not show your work, you may
Daria Wong
October 6, 2011
12-421
Problem Set 5
1. (Park 9.17)
a) Straight-line
I = $157,000
S = $27,000 at N = 10
b) Units-of-Production
c) Working hours
d) Double-declining-balance (without conversion to straight-line)
e) Double-declining-balance (with
36-225 - Homework 4 SOLUTIONS
1. 10 points
The problem is asking us to nd P (I1 |H ). By Bayes rule,
P (H |I1 )P (I1 )
P (H |I1 )P (I1 ) + P (H |I2 )P (I2 ) + P (H |I3 )P (I3 )
(.90)(.01)
=
(.90)(.01) + (.95)(.05) + (.75)(.02)
.126
P (I1 |H ) =
2. 10 poi
STAT 225 - Homework 4
Due Friday, September 24
1. This homework is due Friday, September 24 in class, BEFORE class starts.
2. Please remember staple if you turn in more than one page.
3. You must always show all work. If you do not show your work, you may
36-225 - Homework 2 SOLUTIONS
1. 18 points: 3 for each part (2 for work, 1 for numerical accuracy)
A smoke detector system uses two devices, A and B. If smoke is present, the probability that
it will be detected by device A is .95; by device B, .90; and b
STAT 225 - Homework 1
Due Friday September 3
Comments:
1. This homework is due Friday, September 3 in class, BEFORE class starts.
2. Please remember to staple if you turn in more than one page.
3. You must always show all work. If you do not, you may not
36-225 - Homework 1 SOLUTIONS
1. 5 points: 1 for each of rst three parts, 2 for last
(a) Both events occur.
AB
(b) At least one event occurs.
AB
(c) Neither event occurs.
A B or A B
(d) Exactly one event occurs.
(A B ) (A B )
Another approach is to subtra