E280 chapter 2 unit b exam 1

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  1. Frequency distribution
    for qualitative data groups data into categories and records the number of observations that fall into each category
  2. relative frequency
    of each equals the proportion (fraction of observations in each category. A category's relative frequency is calculated by dividing the frequency by the total number of observations. the sum of the relative frequencies should equal one
  3. percent frequency
    is the percent of observations in a category; it equals the relative frequency of the category multiplied by 100%
  4. pie chart
    is a segmented circle whose segment portray the relative frequencies of the categories of some qualitative variables
  5. bar chart
    depict the frequency or the relative frequency for each category of the qualitative data as a bar rising vertically from the horizontal axis
  6. for quantitative data, a frequency distribution groups data into intervals called classes, and records the number of observations that falls into each class
  7. cumulative frequency distribution
    records the number of observations that falls below the upper limit of each class
  8. relative frequency distribution
    • for quantitative dat, a relative frequency distribution identifies the proportiom(of the fraction) of values that fall into each class, that is
    • class RF=Class frequency
    •                total number of values
  9. cumulative relative frequency distribution
    records the proportion (or the fraction) of values that fall below the upper limit of each class
  10. histogram
    is a series of rectangles where the width and height of each rectangle represent the class width and frequency( or relative frequency) of the respective class
  11. ogive
    is a graph that plots the cumulative frequency or the cumulative relative frequency of each class against the upper limit of the corresponding class
  12. scatterplot
    is a graphical tool that helps in determining whether or not two variables are related in some systematic way. Each point in the diagram represents a pair of know or observed values of the two variables

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E280 chapter 2 unit b exam 1
2015-05-15 15:04:40
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