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Unformatted text preview: Appendix: Making & Using Appendix: Making & Using Graphs Graphs • Why bother? • Graphs & Data • Graphs & Models • Slope Why bother? Why bother? • visual relationship between to variables • analyze & understand information ideas • “A picture is worth a thousand words” • corny, but true • a graph conveys info more clearly & quickly than words Graphs & Data Graphs & Data • scatter diagram graph x value that corresponds to y value relationship between x and y do they move in same direction? opposite direction? varied directions? example: consumption & income example: consumption & income each point = 1 year as income rises, so does consumption • timeseries graph measures the behavior of a variable over time x axis = time y axis = variable Is variable high or low? rising or falling? stable or volatile? example: price of coffee example: price of coffee price is volatile no longterm trend of rising or falling price ranged between $1$5 per lb. •...
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 Spring '11
 Slope, Elementary mathematics

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