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FREQUENCY
TERMS
Class midpoint a value for a class in a frequency distribution obtained by adding the lower and upper class boundaries( or the lower and upper class limits) and diving by 2.
Frequency - the number of values in a specific class of a frequency distribution
Frequency polygon a graph that displays the data by using lines that connect points plotted for the frequencies at the midpoints of the classes.
Grouped frequency distribution a distribution used when the range is large and classes of several units in width are needed.
Pie graph a circle that is divided into sections or wedges according to the percentage of frequencies in each category of the distribution
Raw data data collected in original form
Skewed distribution when data values are tapered off to the left or the right
Time series graph a graph that represents data that occur over a specific time
Fill-in-the-Blank
1) When data are collected in original form, they are called ___.
Raw data
2) The ____ is the number of values in a specific class of distribution.
Frequency
3) The ____ is obtained by first adding the lower and upper limits and the dividing by 2.
Class midpoint
4) When the range is large and classes that are several units in width are needed, a ____ frequency distribution is used.
Grouped
5) The three most commonly used graphs in research are the histogram, the ____ , and the cumulative frequency graph(ogive).
Frequency polygon
6) If data is clustered at one end or the other, it indicates that there is a _____.
Skewed distribution
7) The percentage of white, wheat, and rye bread sold at a supermarket each week is best shown using a _____ graph.
Pie
8) A _____ would most appropriately represent the number of students that were enrolled in Statistics for the past ten years.
Time series graph
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