Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Frequency Table - Statistics - Exam, Exams of Statistics

This is the Exam of Statistics and its key important points are: Frequency Table, Sample Mean, Sample Standard Deviation, Sample Median, Sample Mode, Upper Class Boundary, Class Mark, Relative Cumulative Frequency, Cumulative Frequency, Available

Typology: Exams

2012/2013

Uploaded on 02/14/2013

archan
archan ๐Ÿ‡ฎ๐Ÿ‡ณ

3.8

(5)

92 documents

1 / 11

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
201 โ€“ 257 โ€“ DW Statistics, Department of Mathematics, Dawson College
1
DAWSON COLLEGE
DEPARTMENT OF MATHEMATICS
201-257-DW
STATISTICS
FALL 2009
FINAL EXAM
Name:
Date: December 18, 2009
Student Number:
Time: 9:30 โ€“ 12:30
Examiner: Dr. Garry Ka Lok CHU
Instructions:
1. No books or notes are permitted.
2. Only calculators without text storage and graphical capability are permitted.
3. Please show all your work clearly.
4. Please justify all your answers.
5. Cheating will result in a penalty of zero in your final grade.
6. Pease write P.T.O. if you write your answer at the back of the page.
7. Unless otherwise stated, correct your answer to 4 decimal places.
pf3
pf4
pf5
pf8
pf9
pfa

Partial preview of the text

Download Frequency Table - Statistics - Exam and more Exams Statistics in PDF only on Docsity!

DAWSON COLLEGE

DEPARTMENT OF MATHEMATICS

201-257-DW

STATISTICS

FALL 2009

FINAL EXAM

Name: Date: December 18, 2009 Student Number: Time: 9:30 โ€“ 12: Examiner: Dr. Garry Ka Lok CHU Instructions:

  1. No books or notes are permitted.
  2. Only calculators without text storage and graphical capability are permitted.
  3. Please show all your work clearly.
  4. Please justify all your answers.
  5. Cheating will result in a penalty of zero in your final grade.
  6. Pease write P.T.O. if you write your answer at the back of the page.
  7. Unless otherwise stated, correct your answer to 4 decimal places.
  1. [8 Marks] Here is the frequency table of a sample: Class Class Limits Frequency 1 13 โ€“ 19 18 2 20 โ€“ 26 121 3 27 โ€“ 33 44 4 34 โ€“ 40 17 a. Estimate the sample mean. b. Estimate the sample standard deviation. c. Estimate the sample median. d. Estimate the sample mode. e. Find the upper class boundary of class 1. f. Find the class mark of class 4. g. Find the relative cumulative frequency of class 2. h. The cumulative frequency of class 3.
  1. a. [3 Marks] A student receives an average of 21 e-mails every week. Calculate the probability that the student receives exactly 40 e-mails in a 15-day period. b. [4 Marks] 27% of Dawson students use Linux. A sample of 19 students is selected. Find the probability that the number of students using Linux is more than 2.

c. [4 Marks] Scores on a statistics test are normally distributed. The standard deviation of the distribution is 5.0, and the twenty-first percentile for the test is

  1. Find the mean score for this test.
  2. [3 Marks] A test was conducted to investigate the relationship between the number of pages printed by a printer and the time required. Use least-squares to predict the time to print 80 pages. X (number of pages) 20 40 60 100 Y (time in seconds) 19 26 44 65
  1. [7 Marks] A college claims that more than 80% of the students using PC. A random sample is selected and 877 out of 1000 students use PC. Test this claim using ! = 0.05.
  1. [10 Marks] A professor claims that the students at Dawson College score at least an average of 85 on a statistics exam. A random sample of exam scores yields 83, 82, 78, 87, 80, 82 and 89. Complete a hypothesis test using ! = 0.05. Assume the exam results are normally distributed. Also, construct a 95% confidence interval for the true mean exam score.
  1. [7 Marks] A programmer claims that his algorithm is completely random. A random sample of 150 digits is generated and the frequencies are as follows: Digit 0 1 2 3 4 5 6 7 8 9 Frequency 15 10 15 15 20 5 15 10 25 20 Test the claim using ! = 0.1.
  1. [8 Marks] a. 25. b. 5. c. 23 d. 23 e. 19. f. 37 g. 69.5% h. 183
  2. [4 Marks] a. 268435456 b. 39270
  3. [4 Marks] a. 14% b. 48.21%
  4. [11 Marks] a. 4.71% b. 92.05% c. 66.
  5. [3 Marks] 53.
  6. [9 Marks] 1.
  7. [7 Marks] 1.65 < 6. H 0 is rejected. The claim is true.
  8. [10 Marks] -1.943 < -1. H 0 is accepted. The claim is true. [79.458, 86.542]
  9. [7 Marks] -2.58 < -1. H 0 is accepted. The claim is false.
  10. [7 Marks] 14.6837 < 18. H 0 is rejected. The algorithm is not random.