1. Lecture 6: Chapter 4 David Wallace Croft http://www.CroftSoft.com/people/david/ Statistics for Psychology 2005 Jun 01 Wed Copyright 2005 David Wallace Croft This work is licensed under the Creative Commons Attribution License 2.0. http://creativecommons.org/licenses/by/2.0/

2. Quiz Please mute your mobile phones Write your name on a blank piece of paper Quiz will begin at 09:00 When done, turn your paper over At 09:02, I will say, “Pens down” Writing after “Pens down” is cheating Pass your quizzes to your left

3. Outline Administrative Correction Dot Product Chapter 4 Slides Emphasis Homework Exam 1 Review Next Class Questions

4. Administrative If you did not return your exam to me, please do so that I can record the grade I have not yet started entering grades in Blackboard A former T.A. is offering tutoring services

5. Correction Correction to whiteboard example Example problem had M = 0 Z = X / SD only when M = 0 More generally, Z = (X – M) / SD Both scaling and translation

6. Dot Product r squared e-mail question Epiphany while camping The Cross-product is the Dot Product –http://croftsoft.com/library/tutorials/correlation/

7. Chapter 4 Prediction Aron and Aron, “Statistics for Psychology”, 3 rd Ed., 2003.

8. Emphasis When r = 0, the predicted Z score is zero

9. Homework Chapter 4 Set 1, Problem 6 Do the rest

10. Exam 1 Review Mean, Median, and Skew

11. Next Class Friday Read Chapter 5 before class Quiz at start of class Monday Exam will cover Chapters 3, 4, and 5

12. Questions Don’t pack up to leave just yet Questions about lecture before we dismiss? Post additional questions to discussion electronic mailing list unless personal –http://egroups.com/group/utd-statistics