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Lecture 02: Chapter 1

Lecture 02: Chapter 1. Statistics for Psychology David Wallace Croft 2005 May 18 Wed. Quiz 1. 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”

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Lecture 02: Chapter 1

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  1. Lecture 02:Chapter 1 Statistics for Psychology David Wallace Croft 2005 May 18 Wed

  2. Quiz 1 • 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 • Absences • Calculators • Research Exposure Credits Requirement • Textbook Slides • Emphasis • Homework

  4. Absences • No makeup for daily quizzes • Please limit missed exams to emergencies • Early notification of absence is good

  5. Calculators • Not allowed for first exam • Might be allowed for future exams • Not sure yet

  6. Research ExposureCredits Requirement • Detailed Handout • Required to Complete Course • Journal Article Option • textbook footnote, p45 • Catanzaro, D., & Taylor, J.C. (1996). The scaling of dispersion and correlation: A comparison of least-squares and absolute deviation statistics. British Journal of Mathematical and Statistical Psychology, 49, 171-188.

  7. Textbook Slides • Chapter 1: Displaying the Order in a Group of Numbers • http://wps.prenhall.com/hss_aron_statistics_3/0,6590,401853-,00.html

  8. Emphasis • Boxes on Test • Frequency Polygon Zeroes • Direction of Skew • Median Household Income

  9. Direction of Skew 1 “A skewed distribution has one side that is long and spread out, somewhat like a tail. The side with the fewer scores (the side that looks more like a tail) is considered the direction of the skew.” -- textbook, p20

  10. Direction of Skew 2 “In probability theory and statistics, skewness is a measure of the asymmetry of the probability distribution of a real-valued random variable. Roughly speaking, a distribution has positive skew (right-skewed) if the higher tail is longer and negative skew (left-skewed) if the lower tail is longer; getting these the wrong way round is a common error.” -- “Skewness”, Wikipedia

  11. Median Household Income • floor effect • skewed to the right • mean higher than median • mnemonic

  12. Homework • Optional • Do not turn in • Will help you on the exams • Answers to Set I problems in back of book • I have answers to Set II problems • Will help you on the exams

  13. Next Class • Friday • Chapter 2 • Mean, Variance, Standard Dev, Z Scores • Read Chapter 2 Before Class • Pre-Lecture Quiz • Starts at 09:00 • Ends at 09:02 • Exam 1 on Monday

  14. Questions • Questions for Class? • Post to e-mail list unless personal • http://egroups.com/group/utd-statistics

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