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Shapes of Distributions

Shapes of Distributions. Frequency Distributions. Ex:. Frequency Polygon. Frequency Polygon. The greater the number of participants, the smoother the polygon shape - Curve. Normal Curve. Normal Curve Aka…Bell Curve, Bell-Shaped Curve, The Curve Shape found often in nature

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Shapes of Distributions

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  1. Shapes of Distributions

  2. Frequency Distributions • Ex:

  3. Frequency Polygon

  4. Frequency Polygon • The greater the number of participants, the smoother the polygon shape • - Curve

  5. Normal Curve • Normal Curve • Aka…Bell Curve, Bell-Shaped Curve, The Curve • Shape found often in nature • Used as the basis for a number of inferential statistics

  6. Normal Distribution Examples

  7. The Measures of Central Tendency and Distribution When the mean, median, and mode are all at the same point, the center of the distribution, the data is considered to be normally distributed. Mean, Median, Mode

  8. The Measures of Central Tendency and Distribution When data is skewed, values have “bunched” up at one end or the other. With skewed data, the mean, median, and mode are usually all different values. The distribution of the data can be positively or negativelyskewed.

  9. Positive Skew

  10. Negative Skew

  11. Bimodal

  12. Distribution Shapes

  13. Distribution Shapes

  14. p. 19 Chapter 3 # 10 • Frequency Distribution and Percentages • Frequency Polygon based on Percentages • Number of Days Absent from Schools for a sample of 10th graders • n = 28

  15. Frequency Polygon w/ Percentages 0-6 118-120

  16. 0-6 118-120

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