Math 127B, Quiz 5
Thursday, February 24th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. A survey organization takes a simple random sample of 625 houesholds from a city of 80,000 households.
On the average, there
Math 127B, Quiz 1 Solutions
Thursday, January 27th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. A survey is to be carried out to determine the number of seniors in the undergraduate population.
Professors are ask
Math 127B. Practice Exam 2
March 28, 2011
The exam does not make any claim to represent every type of problem that could be on the exam.
All problems are about tests of signicance. You should state the null, alternative, type of test, test statistic,
appr
Math 127B. Practice Exam 2
March 28, 2011
The exam does not make any claim to represent every type of problem that could be on the exam.
All problems are about tests of signicance. You should state the null, alternative, type of test, test statistic,
appr
Math 127B, Exam I, Solutions
February 23rd, 2011
1. I propose you two games.
Dice You roll two dice 100 times. If the average of your rolls is more than 4, you win $1.
Coin You toss a fair coin 400 times. If it lands heads more than 55% of the time, you w
Math 127B. Practice Exam I
February 17, 2011
The practice exam has 4 problems. It does not make any claim to represent every type of problem that
could be on the exam.
1. A survey organization wants to estimate the average age of the US population.
(a) De
Math 127B. Practice Exam I. Solution
February 22, 2011
The practice exam has 4 problems. It does not make any claim to represent every type of problem that
could be on the exam.
1. A survey organization wants to estimate the average age of the US populati
Math 127B. Practice Exam 3 for R
Solutions
April 27, 2011
This is what I did to gure out the answers to the problems in the practice exam. Its mostly just a copy of
the commands I used. The names should be pretty self-explanatory.
1. How large is the data
Math 127B. Practice Exam 3 for R
April 25, 2011
The exam does not make any claim to represent every type of problem that could be on the exam.
This is a practice exam for anyone who plans to do the computer-based R exam.
The problems below require that yo
Math 127B, Exam 2
Solutions with Comments
March 30th, 2011
Statistics related to the Exam
The exam average was an 87%. 60% of the class had a 90% or higher. The average score on each of the
problems:
Problem
Average
Possible
1
2
3
4
35
43
44
53
40
50
50
6
Math 127B. Practice Exam 2
March 28, 2011
The exam does not make any claim to represent every type of problem that could be on the exam.
All problems are about tests of signicance. You should state the null, alternative, type of test, test statistic,
appr
Math 127B. Practice Exam 2
March 28, 2011
The exam does not make any claim to represent every type of problem that could be on the exam.
All problems are about tests of signicance. You should state the null, alternative, type of test, test statistic,
appr
Math 127B, Exam I, Solutions
February 23rd, 2011
1. I propose you two games.
Dice You roll two dice 100 times. If the average of your rolls is more than 4, you win $1.
Coin You toss a fair coin 400 times. If it lands heads more than 55% of the time, you w
Math 127B. Practice Exam I. Solution
February 22, 2011
The practice exam has 4 problems. It does not make any claim to represent every type of problem that
could be on the exam.
1. A survey organization wants to estimate the average age of the US populati
Math 127B. Practice Exam I
February 17, 2011
The practice exam has 4 problems. It does not make any claim to represent every type of problem that
could be on the exam.
1. A survey organization wants to estimate the average age of the US population.
(a) De
Math 127B, Quiz 2 Solutions
Thursday, February 3rd, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. A simple random sample of 900 draws will be made from the box 2 million 0 s, 1 million 1 s .
(a) Give an estimate fo
Math 127B, Quiz 3 Solutions
Thursday, February 10th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. A survey organization wants to estimate the number of households that watch American Idol. In a
sample of 2,500 hou
Math 127B. Practice Exam I. Solution
February 22, 2011
The practice exam has 4 problems. It does not make any claim to represent every type of problem that
could be on the exam.
1. A survey organization wants to estimate the average age of the US populati
Math 127B, Exam I, Solutions
February 23rd, 2011
1. I propose you two games.
Dice You roll two dice 100 times. If the average of your rolls is more than 4, you win $1.
Coin You toss a fair coin 400 times. If it lands heads more than 55% of the time, you w
Math 127B, Exam 2
Solutions with Comments
March 30th, 2011
Statistics related to the Exam
The exam average was an 87%. 60% of the class had a 90% or higher. The average score on each of the
problems:
Problem
Average
Possible
1
2
3
4
35
43
44
53
40
50
50
6
Math 127B. Practice Exam 3 for R
Solutions
April 27, 2011
This is what I did to gure out the answers to the problems in the practice exam. Its mostly just a copy of
the commands I used. The names should be pretty self-explanatory.
1. How large is the data
Math 127B, Quiz 1 Solutions
Thursday, January 27th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. A survey is to be carried out to determine the number of seniors in the undergraduate population.
Professors are ask
Math 127B, Quiz 2 Solutions
Thursday, February 3rd, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. A simple random sample of 900 draws will be made from the box 2 million 0 s, 1 million 1 s .
(a) Give an estimate fo
Math 127B, Quiz 3 Solutions
Thursday, February 10th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. A survey organization wants to estimate the number of households that watch American Idol. In a
sample of 2,500 hou
Math 127B, Quiz 4 Solutions
Thursday, February 17th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. Some information from the CPS is shown below. Based on this compute the unemployment rate. [10
points]
Civilian non
Math 127B, Quiz 6. Key.
Thursday, March 17th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. A coin is tossed 400 times. It lands heads 212 times. [20 points]
(a) Based on this do you believe that there is evidence
Math 127B, Quiz 7
Thursday, March 24th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. An experiment is performed to decide whether calculators help students to work word problems. The
subjects are a group of 500 th
Math 127B, Quiz 7
Thursday, March 24th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. An experiment is performed to decide whether calculators help students to work word problems. The
subjects are a group of 500 th
Math 127B, Quiz 6. Key.
Thursday, March 17th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. A coin is tossed 400 times. It lands heads 212 times. [20 points]
(a) Based on this do you believe that there is evidence
Math 127B, Quiz 5
Thursday, February 24th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. A survey organization takes a simple random sample of 625 houesholds from a city of 80,000 households.
On the average, there