Stat 301 – Week 7 Assignments

As soon as possible

Our next exam is scheduled for Nov. 14.  I’m hoping that a large fraction of you will be willing and available to take the exam in the 9-10 hour.  If this works out, this would allow you to use statistical software and the course applets during the exam.  If it doesn’t work out, we will take the exam as before but probably also have a take home component. In Blackboard, under Assignments there is a link for “Exam 2 options.”  Please indicate whether you are able and willing to take the exam from 9-10 instead.

By the way, looks like we will be able to use both Monday and Tuesday for the final exam.  Enough of you said “no preference” that those who prefer Monday or Tuesday will get their wish and I will randomly split up the others.  Details announced during the last week of classes.

Mini-project 2

Guidelines for the second project, focused on random sampling and due Nov. 17, are posted.  You should be collecting your data soon.

Lab 5 – Due Thursday Nov. 13

Note: You will have other assignments due that day as well so you are encouraged to finish early in the week. If you submit it early as well, I may be able to provide feedback by Thursday.

For Monday

· Submit PP 4.3.4 (d) in Blackboard

· Optional: PP 4.3.5(a). Answer: .18

For Tuesday

· Lab 4

· Exercise 39 (p. 395) gives results from a class survey of 36 students where 3 students said they were vegetarian.  Treat these data as a random sample from this school and in Blackboard, report both a 95% Wald confidence interval and a 95% adjusted Wald confidence interval for the proportion of students at this school that are vegetarian.  Then indicate which interval you would feel more comfortable reporting.

For Thursday

· Submit your answer to the following in Blackboard:

Suppose that the IQ scores of your hometown’s residents follow a normal distribution with mean 105 and standard deviation 12. Which is more likely or do they have the same probability: that a randomly selected resident will have an IQ greater than 120, or that the average IQ in a random sample of 10 residents will be greater than 120?

For Friday – HW 6

1) Exercise #25 (p. 390)

2) Exercise #30 (p. 390-392)

Hint: A graphical summary here is just a bar graph with two categories.

Remember to include your output.  It would not be a bad idea to do these calculations both by hand and with the computer to double check your work (up to rounding discrepancies) and to aid your understanding.  In (e) you might want to reconsider our discussion of PP 4.3.6.

3) Exercise #23 (p. 390)

4) PP 4.3.10 (p. 335)

5) Exercise #50 (p. 399)

6) Exercise #51 (p. 399-400)