chapter 2 unit b E280

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Cshowalter
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chapter 2 unit b E280
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2015-05-30 14:31:10
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  1. frequency distribution (table) for qualitative data
    • groups the data into categories and records how many observations fall into each category
    • this can be done Nominal or Ordinal scale data
  2. A frequency distribution (a table that show frequency of accuracy) for quantitative data
    • groups the data into numerical intervals called classes , and records the number of observations that fall into each class
    • either Interval or Ratio scale
  3. guidelines when constructing frequency distribution (Quantitative data) 
    Approximating the class width
    • Classes are Mutually Exclusive (cannot overlap)
    • Classes are Exhaustive (cannot miss a value)
    • Largest value-Smallest value
    •          Number of classes
  4. Cumulative frequency distribution
    specifies how many observations fall below the upper limit of a particular class
  5. relative frequency distribution
    identifies the proportion or fraction of values that fall into each class

    • CRF=Class freq
    •         total number of observation
  6. histogram
    is a visual representation of frequency or a relative frequency distribution
  7. the shape of most data distributions may be categorized as either
    • Symmetric- a mirror image, same on both side
    • skewed- (positively skewed right) (negatively skewed left)
  8. ogive
    plot the cumulative frequ of each class above the upper limit of the corresponding class
  9. polygon
    plot the class midpoints on x axis and associated frequency in y axis
  10. Steam and leaf diagram
    • visual display of quantitative (numerical) data it gives an overall picture of the data's center and variability data
    • set is separated into two parts; the stem consists of the leftmost
    • digit, while the leaf is the last digit that is relevant for data
    • distinction
  11. scatterplot
    • is uesed to determine if two variables are related
    • each point is pairing
    • Linear- as indicated by an upward or downward sloping trend
    • Curvilinear-
    • no relationship-

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