10/23/08

Only 3 more days until the Giants' showdown with the Steelers. I know you're all probably more pumped than I am for that...

So today in class we'll be working on a Linear Regression project--you'll use the class time to get all of the math done (an outline, pretty much), and for homework you'll have to write up your results in a 1-2 page report. This will be good review for your quiz. To review some of the older (chapter 7) stuff, we'll work through a practice test at the after school review. If you're unable to come, here are the answers to the multiple choice on Practice Test B:

1. B
2. D
3. A
4. A
5. C
6. E
7. C
8. D
9. A
10. C
11 (a) none (b) positive (c) positive (d) negative (e) curved
12. (a) students who send more emails tend to have lower grades (b) this plan assumes cause--point out a lurking variable
13. b = .24, intercept = 5.08; predicted number of cars is 14.68 (or 15)
14. Sorry, too much variation and too much to put up on the blog. Just remember--use your calculator, find the regression. When you interpret slope, you're thinking "how does y change when x changes by 1?" The units for slope will always be "y per x." The intercept should be interpreted as "What happens when x (explanatory variable) is 0?" Remember to think of this in the specific context your given.

Study!

Tomorrow you'll take your quiz, and your weekend homework will be to read chapter 10. READ! TAKE NOTES! There is absolutely no reason for anyone to score under a B on a reading quiz. These grades are simply a matter of effort--if you actually read the chapter (not the summary) and take notes, you will get a 100. For those of you who ask for extra credit, this is as close as it gets. These grades should easily bump up your grade and be a consistent "A" on a quiz. The grades for our Chapter 9 reading quiz were atrocious--and it was the shortest chapter so far!

So in sum, read and take notes on chapter 10 this weekend. Or don't complain about a grade that's not up to your standards.