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7. What is data cleaning? (p.193) What are the major techniques we use to “clean” our datafiles? (book and lecture)8. What is a frequency distribution? (p.200) How do you create a frequency distribution? (p.200-201) Be able to make a correct graphic representation of a frequency distribution. How do people misuse statistics when they make charts and graphs? (p.216) (book and lecture)
9. What are the three main measures of central tendency? (p.201-204) How are each calculated? (p.202-205) What are "normal" (p.209) and "skewed" (p.195) distributions? How do these statistics usually differ in normal and skewed distributions? (p.205) (book and lecture)Characteristics of a normal curve