2127 Words9 Pages

Math 221

Quiz Review for Weeks 5 and 6

1. Find the area under the standard normal curve between z = 1.6 and z = 2.6. First we look for the area of both by doing “2nd ,Vars, NORMALCDF” and inputting “-1000, “Z,” 0, 1 then find the difference between both.

2. A business wants to estimate the true mean annual income of its customers. It randomly samples 220 of its customers. The mean annual income was $61,400 with a standard deviation of $2,200. Find a 95% confidence interval for the true mean annual income of the business’ customers.

First we find E by doing Zc(standard deviation/square root of number of trials.) Now we add and subtract that number from the mean income to find both endpoints. The Zc of 95% is 1.96 so we would do*…show more content…*

11. What z-scores would be used to create an 89% confidence interval?

12. A soccer ball manufacturer wants to estimate the mean circumference of mini-soccer balls within .12 inch. Assume that the population of circumferences is normally distributed.

Determine the minimum sample size required to construct a 95% confidence interval for the population mean. Assume the population's standard deviation is .2 inches.

13. Find the area under the standard normal curve to the left of z = -1.25.

14. True or False. In the standard normal distribution the standard deviation is always exactly 0.

15. Compute the population mean margin of error for a 90% confidence interval when sigma is 7 and the sample size is 36.

16. The area under a normal curve with mu = 35 and sigma = 7 is 0, 1, or 2?

17. If John gets an 90 on a physics test where the mean is 85 and the standard deviation is 3, where does he stand in relation to his classmates? (he is in the top 5%, he is in the top 10%, he is in the bottom 5%, or bottom 1%)

18. Find P(12 < x < 23) when mu = 19 and sigma = 6. Write your steps in probability notation.

19. In a normal distribution with mu = 34 and sigma = 5 what number corresponds to z = -4?

20. Let’s assume you have taken 1000 samples of size 64 each from a normally distributed population. Calculate the standard deviation of the sample means if the population’s variance is 49.

21. Interpret a 93% confidence interval of (7.46, 12.84) for a population mean.

22. The

Quiz Review for Weeks 5 and 6

1. Find the area under the standard normal curve between z = 1.6 and z = 2.6. First we look for the area of both by doing “2nd ,Vars, NORMALCDF” and inputting “-1000, “Z,” 0, 1 then find the difference between both.

2. A business wants to estimate the true mean annual income of its customers. It randomly samples 220 of its customers. The mean annual income was $61,400 with a standard deviation of $2,200. Find a 95% confidence interval for the true mean annual income of the business’ customers.

First we find E by doing Zc(standard deviation/square root of number of trials.) Now we add and subtract that number from the mean income to find both endpoints. The Zc of 95% is 1.96 so we would do

11. What z-scores would be used to create an 89% confidence interval?

12. A soccer ball manufacturer wants to estimate the mean circumference of mini-soccer balls within .12 inch. Assume that the population of circumferences is normally distributed.

Determine the minimum sample size required to construct a 95% confidence interval for the population mean. Assume the population's standard deviation is .2 inches.

13. Find the area under the standard normal curve to the left of z = -1.25.

14. True or False. In the standard normal distribution the standard deviation is always exactly 0.

15. Compute the population mean margin of error for a 90% confidence interval when sigma is 7 and the sample size is 36.

16. The area under a normal curve with mu = 35 and sigma = 7 is 0, 1, or 2?

17. If John gets an 90 on a physics test where the mean is 85 and the standard deviation is 3, where does he stand in relation to his classmates? (he is in the top 5%, he is in the top 10%, he is in the bottom 5%, or bottom 1%)

18. Find P(12 < x < 23) when mu = 19 and sigma = 6. Write your steps in probability notation.

19. In a normal distribution with mu = 34 and sigma = 5 what number corresponds to z = -4?

20. Let’s assume you have taken 1000 samples of size 64 each from a normally distributed population. Calculate the standard deviation of the sample means if the population’s variance is 49.

21. Interpret a 93% confidence interval of (7.46, 12.84) for a population mean.

22. The

Related

## Acc 290 Week 3 Practice Quiz New

844 Words | 4 PagesACC 290 WEEK 3 PRACTICE QUIZ NEW To purchase this visit here: http://www.nerdypupil.com/product/acc-290-week-3-practice-quiz-new/ Contact us at: nerdypupil@gmail.com ACC 290 WEEK 3 PRACTICE QUIZ NEW Question 1 The revenue recognition principle dictates that revenue is recognized in the period in which the cash is received. Question 2 The generally accepted accounting principle which dictates that revenue be recognized in the accounting period in which the performance obligation is satisfied

## 2121 unit information

1576 Words | 7 PagesETF2121/ETF5912 Data Analysis in Business Unit Information – Semester 1 2014 Coordinator and Lecturer - Weeks 7-12: Associate Professor Ann Maharaj Office: H5.86 Phone: (990)32236 Email: ann.maharaj@monash.edu Lecturer - Weeks 1-6: Mr Bruce Stephens Office: H5.64 Phone: (990)32062 Email: bruce.stephens@monash.edu Unit material: No prescribed textbook Unit Book: available on the Moodle site. Exercises: available on the Moodle site. Software: EXCEL. Recommended Reference Books Berenson

## F14 ADMS 4561 course outline Sept 2 14 1

4742 Words | 19 Pagesfor all sections Fall 2014 last updated September 2 2014 1 Contact Information – Course Director Section Day Time Location Course Director Email address Section D Wednesday 4-7 pm HNE 030 Joanne Magee jmagee@yorku.ca Section E Thursday 7-10 pm HNE 035 Margaret Riggin mriggin@vfmy.com Section F Wednesday 7-10pm HNE 032 Joanne Magee jmagee@yorku.ca 2 Course Description Together with AK/ADMS 4562 3.0, introduces students to the principles and practice of Canadian taxation and related tax

## Psych Syllabus Essay

2272 Words | 10 PagesPSYC 1010V COURSE SYLLABUS COURSE Introductory Psychology COURSE CREDIT 4 credit hours TERM/YEAR Win 2014 COURSE LOCATION http://macomb.angellearning.com TIME/DAY 24/7 for eight weeks FACILITATOR Dr. Orlich E-MAIL Angel course e-mail system TEXT Rathus, S.A., PSYCH 3 (Wadsworth/Cengage, 2014) Psychology. COURSE DESCRIPTION & OUTCOMES This course will provide an introductory overview of the nature, scope, and methods of psychology as behavioral science

## Essay on ART 305 Syllabus 1

2559 Words | 11 PagesChicago, CBE, etc) where appropriate. COURSE GRADES I use the total points method. This means that I assign points to each assignment toward a total of possible points in the class. CLASS GRADING 13 quizzes 130 points (10 points each) FINAL quiz 50 points Discussion/Analysis Question 1 10 points Discussion/Analysis Question 2 10 points Discussion/Analysis Question 3 10 points Museum paper 40 points TOTAL 250 points Grading will be done on a plus (+) and minus (-) basis as follows:

## Gs2745 Quiz Essay

1979 Words | 8 PagesProfessional Onsite Course Quizzes & Exams NOTE: Final Exams may not be distributed to students prior to the scheduled exam date. 03/18/2013 Advanced Strategies for the Technical Professional QUIZZES & EXAMS Unit 2 Quiz 1 Scope This quiz covers material from the first unit of the course. Select the one BEST answer to each question below. This is an open-book quiz. Students may consult their textbooks and their own class notes while taking this quiz. Students may not consult any other resources

## Sex and the City

1090 Words | 5 PagesWelcome to WST 371: a 7 week online course. This course will examine how women and sexuality have been depicted in American popular culture from the 1950’s to current day. We will utilize themes and images from various formats, including movies, television, and popular books as well as analyzing different products and stores in considering what ideas and images about sexuality are being marketed and sold. We will consider questions such as: Have popular images of sexuality for women changed over

## Proj 420 Entire Course Project Risk Management Essay

631 Words | 3 PagesPROJ 420 Week 1 Course Project Assignment Project Topic Proposal and Outline PROJ 420 Week 1 Discussion 1 Why Should We Practice Risk Management PROJ 420 Week 1 Discussion 2 The ATOM Risk Management Process PROJ 420 Week 2 Course Project Assignment; Project Sizing and Stakeholder Analysis PROJ 420 Week 2 Discussion 1 The Initiation Step PROJ 420 Week 2 Discussion 2 Risk Identification PROJ 420 Week 3 Course Project Assignment; Project Risk Breakdown Structure PROJ 420 Week 3 Discussion

## SP15 SCM 305 Syllabus

1256 Words | 6 Pagesto discuss the quiz with other students during the quiz or choose to look at notes during a closed note quiz will receive a zero for that quiz; a second occurrence of looking at notes or talking during a quiz will result in discussions with the Assistant Dean of the School of Business. Blackboard: This course includes a Blackboard website at http://courseware.ku.edu. You will find many documents on the site. All class notes/slides and assignments will be posted to Blackboard. Note that Blackboard

### Acc 290 Week 3 Practice Quiz New

844 Words | 4 Pages### 2121 unit information

1576 Words | 7 Pages### F14 ADMS 4561 course outline Sept 2 14 1

4742 Words | 19 Pages### Psych Syllabus Essay

2272 Words | 10 Pages### Essay on ART 305 Syllabus 1

2559 Words | 11 Pages### Gs2745 Quiz Essay

1979 Words | 8 Pages### Acc 403

5354 Words | 22 Pages### Sex and the City

1090 Words | 5 Pages### Proj 420 Entire Course Project Risk Management Essay

631 Words | 3 Pages### SP15 SCM 305 Syllabus

1256 Words | 6 Pages