ࡱ>  wbjbj -h11# EL-τz-y"yy11?!!!y1l!y!!t,^|jl=,*wH0#rwIiI^|^|Ir|(! YI#yyyyI : COB 191 Statistics for Business Spring 2010 Professor Dr. Scott Stevens Showker Hall, Room 229 Tel. 568-3060 Email: stevensp@jmu.edu Website: http://cob.jmu.edu/stevensp Office Hours TTh 2:15 3:15, W noon- 2 PM, F 11 AM 12 noon, or by appointment. Course HYPERLINK "../../../stevensp"http://cob.jmu.edu/stevensp and  HYPERLINK "http://blackboard.jmu.edu" http://blackboard.jmu.edu Websites Required Custom Edition for COB 191 Business Statistics, James Madison University Text Basic Business Statistics, Concepts and Applications Berenson, Levine, and Krehbiel Prerequisites Math 205, or the equivalent. Course 191 is an introductory course in business statistics. Our overall goal is for you to Description become statistically literate. Well be discussing the most widely used statistical measures and techniques: how and when to use them, what they mean, and how to recognize when arguments or conclusions based on statistical data are wrong. Course objectives can be found at  HYPERLINK "http://www.jmu.edu/cob/bba/COB191obj.shtml" http://www.jmu.edu/cob/bba/COB191obj.shtml. Attendance Because of the difficulty of 191 material for most students, attendance at this class is mandatory. When you arrive at class on the second meeting day (Thursday), please select the seat that you will keep for the rest of the semester. Ill pass around a seating chart, and have you sign it. Thereafter, I will check the seating chart at the beginning of each class. If I believe you to be absent, I will call out your name. If you do not respond, you will be marked absent for the day. Showing up late still counts and an absence, so please note the starting time of this class. Excessive absences and/or repeated tardiness (more than two occurrences) may have a negative impact on your grade. . Class runs for only 75 minutes. During this brief time, excursions from the classroom should be for emergencies only. Please take care of foreseeable necessities before class time. In particular, please note that small group work is not an invitation for you to take a break. If youre going to be leaving class early, I want to know about it before class. Grading You are guaranteed a grade at least as good as the "standard curve" would give you (90% - 100% = A, etc.). Grades may be curved in your favor at the end of the semester, if I think it appropriate. Do not count on a curve. In general, I do not use +/- grading. Breakdown Exam 1 15% of Grade Exam 2 15% Exam 3 15% Comprehensive Final Exam 25% Projects 12% Online Quizzes 18% You course grade may be modified by my subjective evaluation of your class participation. An average level of participation will leave your score unchanged. Exceptionally good or poor participation may modify your course average by up to 4% (although such large adjustments are exceedingly rare). You can help your participation evaluation by being prepared for class, asking intelligent questions, answering questions I ask, and taking an active role in the small group work assignments. Apathy, poor preparation or attendance, and inappropriate classroom behavior can only hurt your participation evaluation. Most students will not have a participation modification of their grade. YOUR FINAL EXAM IS ON THURSDAY, MAY 6TH FROM 6:00 8:00 PM This examination is common to all COB 191 sections, and is taken at the same time by all COB 191 students. If you have a legitimate conflict with this exam time, it is your responsibility to make me aware of it as soon as possible. In particular, please check the scheduled final exam times for your other classes at the beginning of the semester. Note that starting Christmas break early does NOT constitute a legitimate conflict. Concerning Your homework score for the semester will be based on a set of short quizzes Homework administered on Blackboard. One or two Blackboard quizzes will become available at 7 PM on each day that we have class, and will remain available until 3 PM on the next day that we meet. Thus, a quiz may become available on Tuesday at 7 PM and remain available until 3 PM Thursday, or two quizzes may become available at 7 PM on Thursday and remain available until 3 PM on the following Tuesday. You will only have one attempt at each quiz, so you should not take it until you have studied the material discussed in class, done your reading, and worked on your homework. You will also have two projects to do in Excel; more on these later. Please believe this: you cannot do well in stat without doing four things: Reading carefully and thoroughly. Attending class regularly and attentively. Getting your hands dirty and doing a LOT of homework. THINKING about how all of the pieces fit together to make a sensible whole. (Ill be asking concept as well as computation questions on tests.) Assignments Your homework assignments, both reading and problem solving, are listed on the following pages. I also encourage you to regularly check the Announcements line and hotlink on my home page as well. Any issues of importance that have arisen since the last class will be posted there. Well be using Microsoft Excel as our statistical analysis tool, so be sure that you have access to the program. If youve gotten rusty with Excel, take a little time to refamiliarize yourself with its basic operation. All of the details of Excels statistical functions will be covered in the course, but basic competency is your responsibility. If you need help in achieving this competency, let me know and Ill point you toward some useful resources. Policy on Adding Courses Students are responsible for registering for classes and for verifying their class schedules on e-campus. The deadline for adding a Spring semester class without instructor and academic unit head signatures is Tuesday, Janaury 19, 2010. Instructor and academic unit head signatures are required to add a class between Wednesday, January 20 and Thursday, January 28. No student will be allowed to register for a Spring semester class after Thursday, January 28. No exceptions will be made to these deadlines. Day by Day Syllabus To prepare for class for Thursday, January 14th , please do the following: Read Chapter 1 of your text, paying special attention to section 5. Answer questions 1.2, 1.3, 1.5, and 1.12 to 1.18 orally. (Note: you should be prepared to intelligently discuss any of the oral problems in class. This is a general expectation for this class.) Consider question 1.10. Do you agree with the position advanced in the problem? Why or why not? (Oral) Access the 191 page of my website (cob.jmu.edu/stevensp). Familiarize yourself with any additional relevant information that you find on the COB 191 page of the site. (Theres a lot of it!) In particular, take a look at the Demonstrations and the Statistical Templates. Both of these can save you a lot of wasted effort in this class. Log on to Blackboard at  HYPERLINK "http://blackboard.jmu.edu" http://blackboard.jmu.edu and take your first online quiz. Youll want to check for new quizes after each class session. Read Appendix E1 in your text. Play around with Excel to brush up your spreadsheet skills. It will be assumed throughout this course that you are familiar with these Windows and Excel fundamentals. Throughout the course, ignore any Minitab or PHStat work. These are different software applications, and we wont be using them. Before class on Tuesday, January 19th, please do: Skim through Demonstrations I on my website (cob.jmu.edu/stevensp) to learn about graphs and how to create them in Excel. Test your Excel skills by having Excel create a bar chart of the data in problem 2.5. Now make a pie chart of the same data. (Note that topics A and B in Demonstrations I explicitly walk you through creating these kinds of graphs.) Bring your pie chart to class. Read section 2.1. Do problem 2.3 in Excel. (Topics A, B, C and E in Demonstrations I are intended to help you with this.) Do problem 2.6ab by hand, but draw only a quick, rough sketch of the Pareto diagram. If you are having Excel problems, Appendix A2.1 might help you. Trouble with relative frequency (percentages)? Read C in Demonstrations I at my website. Read section 2.2. Do problem 2.18. (Note that the data files are on your books disk, so that you dont need to enter them by hand.) If you have trouble with stem and leaf, read F in Demonstrations I. (continues on next page) Read section 2.3. Do problems 2.21 and 2.22. For problem 2.22, you might find the following table useful. Its the frequency distribution for the raw data. I created it using my Frequency Distribution, Histogram, and Box and Whisker Plot template. Values at leastbut less than frequency8010041001207120140914016013160180918020052002203 Topics G and H in Demonstrations I should be of help for working in section 2.3. My template Common Frequency Polygons and Ogives should also be useful in this regard. For the histogram itself, my template Frequency Distribution, Histogram, and Box and Whisker Plot should help. I strongly encourage you to take advantage of these resources. Again remember that you must check for new quizes after each class. In almost all cases, there will be one. (If there is no new quiz, there should be a notice to that effect.) Youll have two of them to complete before Tuesday. Note: these problems are the MINIMUM that you should do. If you find a problem troublesome, work additional problems. The early problems in each section (Learning the Basics) can help you build the necessary skills. Im assigning such a small number of homework problems to give you every reason to do all assigned homework. Many of you will need more problems to do well in the course. WORK THEM! Before class on Thursday, January 21st, please do: Read section 2.4 and 2.5. Well have more to say about contingency tables later, in the online reading, but topic I in Demonstrations I should give you an idea of what you can do with these. Do problems 2.30 and 2.40 in Excel. (As always, print off your results and bring them to class.) The quiz for today wont require you to have mastered contingency tables. Demonstrations I, topic K deals with scatter plots. Demonstration I, topic D deals with line graphs. Review Chapter 2. Look through the Chapter Review problems, pick some out at random, and determine which tools from the chapter you would use to address these problems. You need not write anything for this exercise, but its a great way to self-assess. If you arent sure that you could do one of these review problems, give it a try. If you get stuck, youve identified a weakness that we need to address. Read section 3.1. You can skip the discussion of the geometric mean. Do problem 3.1a and 3.2a by hand. Read section 3.2, ignoring the material on Minitab, as always. Finish doing problem 3.2 by hand. Check your answer in the back of the book. Now use Excel to find all of the quantities in 3.2a and b. (The functions MEDIAN, AVERAGE, MODE, STDEV, and VAR should be of use to you. The advantage of Excel is speed and accuracy; the disadvantage is that you may not know what youre doing!) Do problem 3.15 neatly, either in Excel or by hand. You may use my templates for the calculations if you wish. While I will not collect this assignment, its important to be able to organize a statistical presentation. Youll need the skill for your statistical project later in the semester. Remember the quizzes! Before class on Tuesday, January 26th, please do: Read section 3.3. Use Excel to compute the values requested in 3.21. Why must you use VARP and STDEVP to get the right answers? Look over 3.24. If youre unsure how you should do it, bring your questions to class. Read all of Demonstrations II at my website, with the exception of topics P and Q. Note that you are not responsible for midrange and midhinge in topic R. Read section 3.4. Do problem 3.32. (Recall that you can check your answers to even numbered problems in the back of the book.) Note that the formula given for standard deviation assumes that you are dealing with a sample hence the symbol S and the denominator (n-1). If the data represents a population, the appropriate symbol would be , and the denominator would be the population size, N. Read topic Q in Demonstrations II. Before class on Thursday, January 28th, please do: Read section 3.5. Do problem 3.42 in Excel, using the (unmodified) box and whisker plot template available at my website. Be sure you understand all of the calculations that the template is doing, and what each line or end in the box and whisker plot tells you. You should be able to do this problem by hand, if the need arose. Read topic P from Demonstrations II. Skim section 3.6. You may ignore the formulas. Just get a sense of what r is telling you, and what it means for r to be close to 1 close to 1 close to 0 positive, or negative Flip through the problems in the chapter review. You need not do the problems, but be sure you would know how to approach them. If you dont, review the chapter text again. If you still are at a loss, bring your questions to class. This is a real assignment, and this approach is a useful way to prepare for a test. Read pages 6-1 to 6-8 of the text supplement Probabilities and Expected Values which you will find on the website. This reading replaces much of the Chapter 4 material from your text, although both sources cover the same material. Use your textbook as a secondary source when working on this chapter. Before class on Tuesday, February 2nd, please do: Catch up with anything from previous weeks that is still causing your problems. Answer questions 4.1, 4.6, 4.8 and 4.10 in the text orally. Start work on your first project. Its due on Thursday, February 11th. See my website for details. Read pages 6-9 to 6-14 of the text supplement Probabilities and Expected Values which you will find on the website. The tables described there can make working with conditional and joint probabilities much easier, and pretty much summarize the formulas that you read about for Fridays class. Work through the example carefully to make sure you see where all of the numbers come from. Do problem 4.22. Write it up neatly, either by hand or in Excel. Do problem 4.26. Write it up neatly, either by hand or in Excel. (Our tables should be useful.) Before class on Thursday, February 4th, please do: Read pages 144-146 in your text to lock down the ideas of classical, empirical, and subjective probability. Note that the text uses A for the complement of A, while my writeup used ~A. If Venn diagrams are fuzzy to you, review them, too. Read pages 150-152 in the text on the General Addition Rule. Orally answer question 4.5. Answer questions 4.29. Orally answer 4.54 through 4.61. Do problem 4.63. You only have to create the Venn diagram and contingency table for one of the types of purchases. Read sections 5.1 to 5.3 in your text. (You only need to skim 5.2.) Look back at topic C in Demonstrations I and think about how it relates to section 5.1. Read topic T in Demonstrations III. Before class on Tuesday, February 9th, please do: Review all materials to date in preparation for your exam. You are permitted to bring one 3 x 5 card to the exam as a cheat sheet, and to write (on both sides of it) anything that you would like. Note that there are files available on my website that contain sample problems and solutions. Look over the course objectives list on the website as wellthe test is structured around the objectives in headings 1 through 4. Its wise to be aware of the fact that, although the material on this exam is the easiest in the course, many students prepare poorly and earn bad grades. You need to understand what youre doing, not just mechanically go through the motions. The sample exams on my website should be useful study tools. Do problem 5.2 and 5.25. Read Section 5.4 in your text. If you have not yet done so, read topic T in Demonstrations III at my website. While youre playing with Excel, figure out how to use the = POISSON() function. To do this, type =POISSON( in any empty cell, then click on the = sign that appears to the left of the editing window near the top of the Excel sheet. (It may appear as fx on your machine.) Excel will pull up a help window for the Poisson function. Youll be expected to be competent in the use of both =BINOMDIST() and =POISSON(). Using =BINOMDIST() is discussed in detail in T, and the use of =POISSON() is identical in almost all important respects. You are welcome to use these functions in doing your homework with these distributions. Do problem 5.32c without using Excels =POISSON() function. Do 5.34 in Excel. Do problem 5.6. Optional Review Session for Exam 1: Wednesday, February 10th, 7 PM Before class on Thursday, February 11th, please do: Review for your exam. EXAM 1 (Chapters 1 4) FIRST PROJECT DUE at beginning of class. February 16th: Assessment Day. No class. Before class on Thursday, February 18th, please do: Do 5.32, 5.37. Read problems 70 through 74. When you come to class be prepared to state whether each problem should be approached with the binomial distribution, the Poisson distribution, or neither. (For ones that say that they use the Poisson, explain why this distribution is reasonable for the situation described.) This is an important skill that youll need for your exams and quizzes. Read Sections 6.1 and 6.2 in your text. Ignore any discussion of using Table E.2 in the back of the book to compute probabilities from z scores. Well use Excel to do this. You should understand the concept of z scores, however. IMPORTANT! On the website, topics U and V in Demonstrations III, which deal with the meaning and usage of the normal distribution, as well as instructions of how to use Excel with the normal distribution. Also read how to use =NORMSINV() in topic X of Demonstrations III. You can ignore the three other functions in topic X.. Answer questions 6.43 to 6.46 orally. Before class on Tuesday, February 23rd, please do: Do problems 6.4, 6.5, and 6.10 in Excel. (Note that the answers to 6.10 are in the back of the book.) When doing this and any future assignments in Excel, you should follow the guidelines appearing below. If you have any problem in following them, be with specific questions on Wednesday. When you submit problems or projects to me, Ill expect these guidelines to be followed. Moreover, your teachers in later classes will expect you to follow similar guidelines. (You are not required to turn in the current assignment. The instructions below are just to give you time to develop good habits and iron out any problems.)  Before class on Thursday, February 25th, please do: Read Sections 6.4 and 6.5. Do problems 6.24 and 6.29. Orally answer 6.49. Think about how the =NORMSDIST() function in Excel compare in purpose to formula 6.7 in your book. (Its worth the time; theyre both doing exactly the same thing for two different distributions.) Review all topics read in Chapter 6 and in topics T, U, V and X in Demonstrations III. (The only part of Section X that youll need is =NORMSINV().) Do problem 6.54 in Excel. Follow the guidelines to create a document suitable for submission. Before class on Tuesday, March 2nd, please do: Important! Read topic W in Demonstrations III with great care. The rest of this semester will be work based on a single ideathe sampling distribution. If you understand it, the rest of the semester will be MUCH easier. Read Sections 7.3 and 7.4 in your textbook. Review topic W in Demonstrations III. (Think that you dont need to? Then create the sampling distribution of the median for the population {1, 2, 4, 8} with samples of size n = 3, when sampling with replacement. If you cant, you need to read it again!) Ill be honestits an idea that takes a bit of time to get your mind around. Read carefully, and well be talking about it in class on Thursday. Before class on Thursday, March 4, please do: If you want to learn a bit more, read section 7.6 on the CD ROM that comes with your book. It talks about the small and consistent change that is made to standard deviation calculations when drawing from a finite population. I wont test you on 7.6, but it can be useful stuff. Do problems 7.19, and 7.20. 7.20 can help you to better understand what a sampling distribution is. Do problem 7.23 in Excel. Read Sections 7.1, 7.2 and 7.5. Read topics Y and Z in Demonstrations III. (Topic Y may include more background than you want. You can cut to the chase as described in that section, if you want.) Do problem 7.27, 7.28, and 7.30. (Note that, if you do 7.30 in Excel, then part d can be answered simply by changing one number in your spreadsheet.) If you are AT ALL hazy with section 7.4, work additional problems from that section. 7.26 would be a good choice, for example. SPRING BREAK MARCH 8TH THROUGH THE 12TH. NO CLASS. Before class on Tuesday, March 16th, please do: Read section 8.1 in your text. Read topic AA of Demonstrations IV very carefully. Read section 8.2 of your text. Read topic AB in Demonstrations IV. In your text, do problems 8.3, 8.6, 8.9 and 8.18. Note that my templates for confidence intervals on my website can be useful in helping you to master this stuff. Optional Review Session for Exam 2: Wednesday, March 14th, 7 PM Before class on Thursday, March 18th, please study! EXAM 2 (Chapters 5-7) on Thursday. Prepare! If you didnt do well on the first exam, it is essential that you apply yourself more thoroughly now. The scores on this exam are dreadful for people who dont really crack the books. Before class on Tuesday, March 23rd, please do: Read section 8.3 of your text. Read topics AC in Demonstrations IV. Read section 8.4 in your text. Read topic AD in Demonstrations IV. In your text, do problems 8.22, 8.23, 8.24, and 8.25. Orally do question 8.60, 8.61, and 8.62. Be prepared to answer them in class. Note that my templates for confidence intervals on my website can be useful in helping you to master this stuff. Before class on Thursday, March 25th, please do: Do problems 8.32, 8.33, 8.43ac, and 8.48 in your text. Note that my templates for confidence intervals on my website can be useful in helping you to master this stuff. Review Chapter 8 topics. Tie Chapter 8 in with Chapters 6 and 7. These review days are an important part of the syllabus. By the end of the semester, many of these ideas will make sense. We want to take the time to make the make sense NOW. This ONLY happens by your working problems, thinking about this stuff, and making it fit together! Before class on Tuesday, March 30th, please do: Look over problems 8.66 to 8.84. For each, determine if the problem is dealing with a mean or a proportion. This skill is essential for your exams. Be sure that you can explain clearly what a 95% confidence interval tells you. Read sections 9.1 in your text, including From the Authors Desktop. Orally answer questions 9.1 and 9.2. Before class on Thursday, April 1st, please do: Read the writeup Explanation of Hypothesis Testing on my website carefully. Think about what this stuff means, and how it ties in with Chapters 7 and 8. It takes a while to get comfortable with it. Do problem 9.9 and 9.10. Before class on Tuesday, April 6th, please do: Read Section 9.2. Do problems 9.16, 9.17, 9.20, and 9.22, 9.33. Note that my templates for hypothesis testing on my website can be useful in helping you to master this stuff. Before class on Thursday, April 8th, please do: Read Section 9.3. Do problems 9.34, 9.35, 9.38, 9.40, 9.44, and 9.47. Note that my templates for hypothesis testing on my website can be useful in helping you to master this stuff. Before class on Tuesday, April 13th, please do: Read section 9.4. Do problems 9.52, and 9.54. Note that my templates for hypothesis testing on my website can be useful in helping you to master this stuff. Before class on Thursday, April 15th, please do: Review readings. Reread Explanation of Hypothesis Testing on my website. Do problem 9.51. Note that my templates for hypothesis testing on my website can be useful in helping you to master this stuff. Answer questions 9.64 to 9.64, skipping 9.66. Look at 9.73. Id also encourage you to look over problems 9.74 to 9.82, and in each case determine if the test is of a mean or a proportion, as well as whether the test is 1 tailed or 2 tailed. Whats the null hypothesis in each case? Before class on Tuesday, April 20th, please do: Read Section 10.1. You will not be required to do the section 10.1 tests from scratch in Excel. Look over my templates for hypothesis testing the difference of two means at the website. Also look at the t and z tests available under Tools/Data Analysis Menu. Excels data analysis can handle cases when you are given the raw data (rather than the summary statistics). My templates can handle either. Do problem 10.2. Your project will be assigned to you in class on this day. It will be due Thursday, April 29th, at the beginning of class. Before class on Thursday, April 22nd, please do: Do problem 10.14 and bring it to class. Youll probably want to use my spreadsheet to do this. Read section 10.2. In this section, we deal with two samples with a special relationship. Each observation in the sample from Population A has a naturally corresponding mate in the sample from Population B. Our first step with such data is to collapse these two samples into a single sample of differences by the simple formula (new value) = (population A observation) (corresponding population B observation) Once you to this, you have a single data set, and proceed exactly as you do in Chapter 9. The formulas in section 10.2 say no more than this. Before class on Tuesday, April 27th, please do: Complete your project. Be sure that it meets all of the submission requirements detailed in the assignment. The project is due at the beginning of class, so give yourself time to cope with any last minute emergencies. Prepare for the exam on Thursday. Optional review session, Wednesday, April 28th, 7-8:30 PM Before class on Thursday, April 29th, please do: SECOND PROJECT DUE at beginning of class Prepare for Exam 3 (Chapters 8-10), Thursday, April 29th YOUR FINAL EXAM IS ON THURSDAY, MAY 6TH FROM 6 - 8 PM. Standard Operating Procedures for All Excel Homework Submissions Youll need to print two separate copies of your spreadsheet. Heres how. Choose the Print Preview option from the File menu. Push the Setup button. Now click on the Sheet tab. Make sure that the boxes by gridlines and row and column labels are checked. When youve done this, click on the Page tab. Tell Excel to fit to 1 page wide by 1 tall. You may find your printout is easier to read if you choose landscape printing (to turn the page sideways). Look at it both ways, and choose the one that fits the page better. Print your sheet. Now, press ctrl - ~. That is, while holding down the control key, press the tilde (~). This will switch your spreadsheet into formula view, so that I can see your calculations. Adjust your column widths on your table so that I can read all of your formulas, then reprint. Press the ctrl-~ again to return to numeric view. Take the couple of minutes to make the printout readable, okay? Dont turn in to me something that youd be ashamed to turn in to your boss. It should be clear to me what problem you are solving, what numbers represent what, where the answer is, and so on. For example, the cell containing the population mean should be next to a cell with the label mu, or population mean or the like. 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