Stat 1000: Assignment 12 Tips (Distance/Online Sections)

Published: Thu, 11/22/12


 
My tips for Assignment 12 are coming below, but first a couple of announcements.
 
Please note that my final exam prep seminar for Stat 1000 will be on Saturday, Dec. 1, in room 100 St. Paul's College, from 9 am to 9 pm .  For complete info about the seminar, and to register if you have not done so already, click this link:
Stat 1000 Seminar 
 
I am also offering seminars in Calculus, Linear Algebra, and Stat 2000 in the coming weeks.  You can get info about those seminars here:
Grant's One-Day Exam Prep Seminars
 
If you ever want to look back over a previous tip I have sent, do note that all my tips can be found in my archive.  Click this link to go straight to my archive: 
Grant's Homework Help Archive
 
Make sure you have read my Tips on How to Do Well in this Course
 
Did you miss my Tips on what kind of calculator you should get? Click here
 
Did you miss my Tips for Assignment 11? Click here
 
If you are taking the course by Classroom Lecture (Sections A01, A02, etc.), click here for my tips for your Assignment 5.
 
Tips for Assignment 12 (Distance/Online Sections D01, D02, D03, etc.)
 
Study Lesson 11: Inference for Proportions in my book to prepare for this assignment.
 
You will be using Table A while learning this lesson and doing this assignment.  Here is a link where you can download the table if you have not done so already:
Table A
 
Question 1 is just the rule of thumb; np and n(1-p) must be at least 10 each.  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 (those of you with an older book may have the p-hat bell curve stuff as question 1 of Lesson 10).  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.  They want you to type the lower and upper limits of the confidence interval in the respective boxes.
 
Question 4 is both a confidence interval and a sample size question using the proportion formula I teach in Lesson 11.  Recall that I show you how to get z* for an unusual level of confidence back in Lesson 8, question 10.  Also note that the margin of error of any confidence interval is the number you write after the "+/-" (Estimate +/- Margin of Error).  Which is to say, it is z* multiplied by the standard error of p-hat.  The last part of the question wants you to use the conservative approach when deciding what to use for p*.  Do not use the p-hat you computed earlier in the question.
 
Question 5 is just a standard hypothesis test for proportions as taught in Lesson 11.

Question 6 is just more practise at the concepts in Lesson 11 (and concepts about confidence intervals and hypothesis testing in general).  Everyone gets different questions here.