# Shared Flashcard Set

## Details

Frequency Distributions
Diffierent ways of graphing data for GR.12 Data Management
10
Mathematics
03/02/2010

Term
 Frequency Distribution
Definition
 Shows the # of times the possible values for a variable occur in a data set. They can be displayed in tables or diagrams (bar graph, histograms, frequency pologon) to give an overview of the data and reveal trends in data.
Term
 Frequency
Definition
 The number of values of a variable in a data set that falls within a given category or interval (I.E. 5-X, 2-Y, 7-Z).
Term
 Relative Frequency
Definition
 The # of values of a variable in a data set that fall within a catagory/interval, divided by the total number of values in data set, only for quantitive variables (I.E. 7-X, out of 33 total, 7/33 or 21%)
Term
 Cumulative Frequency
Definition
 The sum of all frequencies up to a certain value of the variable, applying only to quantitive variables ( 2-X, 4-Y cumulative frequency = 6).
Term
 Relative Cumulative Frequency
Definition
 The sum of all relative frequencies up to a certian value of the variable (I.E. 1-X, 2-Y, 3-Z, out of 33, r.c.frequency = 6/33 or 18%).
Term
 Qualitive Variables: Name the columns of a frequency table
Definition
 Category, Tall, Frequency, and Relative Frequency.
Term
 Qualitive Variables: What type of graph is used for these variables?
Definition
 A bar graph, with small spaces seperating the bars. Catagories fall on the X-axis, and frequency or relative frequency on the Y-axis.
Term
 Quantitive Variables: In a frequency table, what are the columns?
Definition
 Categoy, Tally, Frequency, Cumulative Frequency, Relative Cumulative Frequency.
Term
 Class Intervals
Definition
 Quantitive variables with a large range of possible values are grouped into the values of class intervals. Continuous variables are more likely to be used in this way, while discrete can be grouped into class intervals or not.
Term
 Histogram
Definition
 A frequency diagram for quantitive variables with no spaces between the bars. It has the categories on the X-axis, and Freq., R.Freq., C.Freq., or R.C.Freq. on the Y-axis.
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