Stat 1000: Tips for Web Assign HW 12
Published: Wed, 03/23/11
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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 11.
No tips are ready at this time. I will send you tips for HW 12 later.
Study Lesson 10 in my book to prepare for this assignment.
Question 1 is just the rule of thumb; np > 10 and n(1-p) > 10. Simply type "yes" or "no" in the box in each case.
Question 2 is just p-hat bell curve stuff. Take a look at my question 10 in Lesson 6 for the appropriate approach. Note that part b is using the Inverse-Square Relationship that I discuss in Lesson 8, question 8.
Question 3 is a standard confidence interval for the proportion question.
Question 4 is a sample size question using the proportion formula I teach in Lesson 10. Note that I show you how to get z* for an unusual level of confidence back in Lesson 8, question 10.
Question 5 is just a standard hypothesis test for proportions as taught in Lesson 10.
Question 6 is just more practise at the concepts in Lesson 10.