Homework 14 B
Name_
Class Number _
1. The time to failure of 10 batteries was measured. The average time to failure of the 10 batteries is 8.65
hours. The population standard deviation is assumed to b
Dr. Dietrich W. Kuhlmann
[email protected]
Kimball Tower 809
Syllabus Sta119
Probability and Statistics
Spring 2016
COURSE DESCRIPTION
This course covers topics in descriptive statistics, probabili
The Office Hours for each TA are given below.
Rec.
A1
A2
A3
A4
A5
A6
A7
A8
B1
Time
M 10:00
M 11:00
W 9:00
W 8:00
W 12:00
W 1:00
F 10:00
F 11:00
T 5:30
TA
Yingdong Feng
Yingdong Feng
Yuxin Ding
Yuxin D
HW1:
Name _
Class Number _
1. There are for local hospitals in a city. The graph below shows the number of heart patients treated at each
hospital.
Cha r t of He a r t Pa t i e nt s
140
a) What percen
Name_
Turn in HW 5
Class Number_
1. The time to failure of 18 batteries was measured. The average time to failure of the 18 batteries is 22.81 hours
and the standard deviation of the 18 batteries is 1
Turn in HW 2
Name _
Class Number _
1. Data is collected on several individuals from a large university that attended a clinic. Their person type and
injury type are noted and tabulated below.
Injury
T
Name_
Turn in HW 7
1. Use the given data to calculate
Class Number_
sp .
Company A n 16 x 63,500 s 221
Company B n 5 x 49,500 s 403
Answer
2. We wish to determine if a certain diet is effective in hel
Turn in HW 3
Name _
Class Number _
1. Suppose that we have a normally distributed process such that 40 and .4 .
Within 1
Within 2
Within 3
Within 4
.68269
.95450
.99730
.99993666
A Lot of the Populati
Turn in HW 4
Name _
Class Number _
1. The tread life a certain brand of tires is known to be normally distributed with a mean of 50,000 miles and a
standard deviation of 4,000 miles.
a) What is the pr
Homework 22
Name_
Class Number_
1. Data is collected to determine if men and women differ on a certain issue. Of 1500 women polled 435 said
yes to the issue. Of 900 men polled 330 said yes.
a) Do men
Using Probability in Decision Making
A friend has offered us to wager on tossing a coin. If he tosses a Heads we pay him $1. If he tosses a Tails he
pays us $1. If the coin is not a trick coin, then t
Stat 119
Quiz 2
Class Number _
Name_
1. Use the CDF of X to answer the probability questions. Use CDF notation.
x
F(x)
1
.08
2
.12
3
.27
4
.28
5
.36
6
.56
7
.68
6
.15
.9
8
.83
7
.05
.35
a) P ( X = 7)
HW2B:
Name _
Class Number _
1. A survey asked 1200 voters who they would vote for in the next election. Of those surveyed, 432 said that
they would vote for Candidate A. Determine the proportion that
HW24
1. In the general population the racial makeup of five groups is
A company employs 2000 workers. The racial makeup of the four groups in this company is:
Group
Number
1
750
2
380
3
390
4
170
5
31
HW4A:
Name _
Class Number _
As in the class notes, a survey is conducted and tabulated below.
Salary
Total
Degree
Under 20 20 - 30 30 - 40 Over 40
HS Degree
300
250
100
50
700
College Degree
100
250
2
1
HW12B:
Name _
1. Determine the following:
a) P( 1.36 Z < .28)
b) P(1.19 < Z )
c) P( .36 Z 2.18)
d) P ( Z < .83)
e) P(.68 Z < .78)
f) P( 1.65 < Z )
g) Find the number k so that P( Z < k ) = .05
h) De
Homework 18 A
Name_
Class Number_
1. The average flight time using a certain flight path between two cities is 5.25 hours. A new flight path
between these two cities is being considered. It is hoped t
HW4C:
Name _
Class Number _
1. Data is gathered from a university graduate program. Data is collected from each person applying to the
program. Of the 400 male applicants, 100 were accepted. Of the 40
Homework 23 A
Name_
Class Number_
1. Use the data below to test if the population standard deviations differ at the .05 level.
4.18 5.66 5.42 4.40 4.40 5.75 5.04 5.81 3.90 4.86
5.26 5.66 4.80 5.16 6.1
HW3A:
Name _
Class Number _
As in the class notes, a survey is conducted and tabulated below.
Salary
Total
Degree
Under 20 20 - 30 30 - 40 Over 40
HS Degree
200
250
100
50
600
College Degree
100
250
3
Homework 15 A
Name_
Class Number _
1. The time to failure of 10 batteries was measured. The average time to failure of the 10 batteries is 8.65 hours
and the standard deviation of the 10 batteries is