Week 5 Outline

• Answers to assignment 3
• Experimental design
• Discussion of data collection, samples and bias
• Example study: We'll discuss a strategy on the best methods to find something on the Web. Some of the research goals come from this UIE article on search.
• Observational study versus experiment
• Role of randomization in a study
• Probability
• Review assignment 4
• Discuss content of midterm exam on Monday
• Coverage is chapters 1 and 2 plus concept questions on samples, error, bias and experimental design (from chapter 3)
• To study, review quiz, assignments (especially #2 and #3), read sections 2.4 and chapter 3
• You may bring a calculator for the midterm.