Ch. 3_090710 - 09/07/10 Discussion Section 227 Chapter 3:...

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09/07/10 Discussion Section 227 Chapter 3: Graphs Histogram or frequency polygon : use when our IV is measured on an interval/ratio scale and is continuous ; the DV is usually frequency . o The IV goes on X axis while the DV does on the Y axis o The numbers on the X axis are put in the middle of the bars Histogram example: Each box represents an observation or a person in the sample. Counting the number of boxes will give us the sample size. This graph allows us to better understand how our sample distribution looks like in terms of central tendency and variability (spread of scores, skewness, and kurtosis). A polygon is a line graph that displays continuous data. o Place a dot at each point where X and f values are located o Connect the dots. Make sure to connect the ends back to the X axis one unit above and below the highest and lowest points respectively. X (Score) f (frequency) 1 1 2 2 3 4 4 5 5 3 6 2
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Scatter plot or line graph : use when both variables are measured on an interval/ratio scale. o One variable goes on X axis (usually the IV if it is an experiment) and the other on the Y axis. o A line graph is created by drawing a line through the points on the scatter plot. o
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This note was uploaded on 02/21/2012 for the course PYSC 227 taught by Professor Fairchild during the Fall '10 term at South Carolina.

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Ch. 3_090710 - 09/07/10 Discussion Section 227 Chapter 3:...

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