Stat 2000: Tips for Web Assign HW 10
Published: Mon, 03/14/11
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Throughout the term I will send you all sorts of tips to help you study and learn the course. You probably already have done so, but, if not, I strongly recommend you purchase my Basic Stats 2 Study Book. You will find it a great resource to learn the course. I pride myself in explaining things in clear, everyday language. I also provided numerous examples of all the key concepts with step-by-step solutions. You can order my book at UMSU Digital Copy Centre at University Centre at UM campus. They make the book to order so please allow at least one business day. The book is split into two volumes and each volume costs $45 + tax.
General Tips for Web Assign and JMP
When working with Web Assign, always enter the answer to one specific box and then click "Submit Answer" to confirm that is correct before you move on to another box. Do not enter several answers all at once in several boxes before you click "Submit Answer". You risk being marked wrong due to some typo or something.
For some strange reason, JMP 8 occasionally computes wrong answers even if you have copied and pasted your data correctly. I suggest that, if it is feasible, type the given data into your calculator (in Stat mode as shown in Appendix D of my book), and have your calculator compute the sample mean. Compare that answer with JMP's answer for the sample mean. If they are the same, everything is fine. If they are not the same, close JMP 8 and restart it, recopy and paste the data, and check again. Sometimes you have to do this 2 or 3 times before JMP finally works. If it is not feasible to use your calculator to compute the sample mean, have JMP do the question 2 or 3 times, being sure to restart JMP and recopy the data each time, and confirm that JMP gives you the same answer each time before risking entering the results into Web Assign.
If you are taking the course by distance/online (Section D01) click here to see your tips for HW 10.
There are no tips for HW10 at this time. I will send tips later when the assignment is posted.
Study Lessons 7 in my book at least, if you have it, to prepare for this assignment. If you do not have the current edition of my Basic Stats 2 book, I strongly recommend you purchase Volume 2 because the changes have been vast and are addressing changes the course has undergone in the last few years.
Questions 1 to 4 are Lesson 7 stuff, and I am confident you will have no problem doing them once you study Lesson 7. You may want to review how to interpret a confidence interval in Lesson 1 of my book (remember, though, that these are confidence intervals for proportions or the difference between proportions, not means), and review how to interpret a P-value in Lesson 2 of my book (again keeping in mind you are hypothesizing about proportions, not means). Note that, by LCL and UCL, they mean, respectively, Lower Confidence Limit and Upper Confidence Limit. Which is to say, they want the lower and upper limits of your confidence interval.
Question 2(c) requires an alpha/beta table. Re-read the section called "Errors in Hypothesis Testing Revisited" in Lesson 6 (only in the latest edition of my Stats 2 book, volume 1). Of course, you will use a p-hat bell curve, as taught in Lesson 7, to find the appropriate probability.