October 27, 2004
Here's the extra credit problem on the midterm, due next Tuesday in class with your midterm. (I also sent this to everyone via e-mail.)
For this 2 x 2 factorial ANOVA, use the following data:
a1xb1: 3, 5
a2xb1: 3, 6
a1xb2: 9, 10
a2xb2: 20, 22
(Obviously, a = 2, b = 2, n = 2.)
a. What are the null hypotheses for the two main effects and the interaction effect?
b. What are the critical values of F for rejecting each of these null hypotheses?
c. Perform a 2 x 2 ANOVA on these data using the procedure in Keppel and Zedeck. (You should get 3 F-values for the 3 major effects.)
d. Perform a 2 x 2 ANOVA on these data using the geometric approach.
(Be sure to show your work, including computations of all SS, MS, df terms.)
Also, please feel free to e-mail me with questions that you have about the midterm. I did receive one question about how to compute the inverse cotangent. The cotangent is the adjacent side length of a right triangle divided by the opposite side length of a right triangle. So the cotangent is the reciprocal of the tangent, i.e., cot(u) = 1/tan(u) = cos(u)/sin(u).
To get the inverse cotangent (i.e., (cot(u))^(-1)), you'll either need a cotangent table or a scientific calculator that will calculate the inverse cotangent (or the inverse tangent). I believe that the calculator on the PCs in the 207 computer lab has inverse tangent.
September 27, 2004
There was some confusion about when the next homework (at the end of Chapter 2) is due. I only distributed Chapter 2 this past weekend, so the homework for Chapter 2 won't be due this Tuesday in class. It will be due at the beginning of class on Tuesday, October 5.
September 25, 2004
Click here for a PDF version of Chapter 2. It is VERY large. I am also trying to e-mail you a copy. Please let me know if you do not get a copy of this by the evening of Monday, September 27 by sending me e-mail at johnjkim@sfsu.edu.
September 14, 2004
I forgot to go over problems (4b) and (4c) in class today. I e-mailed it to everyone earlier today. You can also download what I e-mailed by clicking herehere. If you have problems reading the e-mail attachment or downloading this file from this website, please let me know. Please try these problems before looking at my work. One hint is that the data for the two problems are the same; the only difference is that the null hypotheses are different for the two problems. I understand that people had luck with (4b) and also the t-test for (4c). This should be a good basis for seeing how the change in null hypothesis might (should/does) change in (4c) compared with (4b). (In general, I included these 2 problems in this order so that it's possible to be able to see what changes and what stays the same as we keep the same data but have a different null hypothesis.)
Also, I will probably have 2 separate readings available for you this week. The first (which will be ready and available before the second) will review much of what we talked about in class tonight. The second will be new material, some of which I hope we'll have time to cover in class next week.
Finally, it turns out that you don't need a table of trignometric functions to show that Fcrit(1,1) = 161.4 if you set the proportion of (4 x theta) to (360 degrees = 2 x pi radians) to .05. You just need an (electronic) scientific calculator, which most computers have on them these days. Here's what you do:
September 13, 2004
Please send me an e-mail (johnjkim@sfsu.edu) by the evening of Monday, September 12 if you were not able to download the PDF file that I made available (below) on September 8 and would like me to make a copy available for you. I will make copies for you, but I don't want to make too many copies. So please send me an e-mail if you want me to bring a copy to class tomorrow. (Or if you would like me to drop a copy off Tuesday morning at the Psychology Department front office for you to pick up, I could do that.)
Also, Joel Warren will start class tomorrow at 5:10pm. I may be a few minutes late depending on how long an important meeting I will be at beforehand goes. I plan to be no later than 5:20pm or so.
September 8, 2004
Click here to download the reading for next week. Part of this reading is review of the material Joel Warren covered this week, and part of it goes beyond what Joel covered. Please do the homework problems at the end of the chapter. (The last question is extra credit, which we will talk about next week in class.) Note that this download is large (about 8 MB), so if you have problems downloading it or printing it, please let me know at johnjkim@sfsu.edu
In case you had problems downloading the last 2 pages (i.e., the exercises), herehere to get them in word format.
September 7, 2004
Please check back here later this week. I will put a PDF file here with the reading for next week. Sorry for the delay.
Click here for the course syllabus.