Stat 1000: Tips for Assignment 12
Published: Sat, 03/31/12
Did you miss my Tips on How to Do Well in this Course? Click here
Did you miss my Tips for Assignment 11? Click here
If you are taking the course by Distance/Online (Sections D01, D02, etc.), click here for my tips for your Assignment 12.
If you are taking the course by classroom lecture (Sections A01, A02, etc.), click here for my tips for your Assignment 12.
There is no Assignment 12 in the Classroom Lecture sections.
Study Lesson 11: Inference for Proportions in my book to prepare for this assignment.
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. 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). 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).