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Chapter 2 - Frequency Distributions and Graphs
Chapter two of elementary statistics
24
Mathematics
Undergraduate 1
09/05/2013

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Term
Frequency Distribution
Definition
The organization of raw data in table form, using classes and frequencies.
Term
Raw Data
Definition
Data which is presented in an unorganized or original form.
Term
Class
Definition
A qualitative or quantitative category into which raw data is placed. (the interval in a frequency distribution)
Term
Frequency
Definition
The number of raw data values contained in a class.
Term
Categorical Frequency Distribution
Definition
A frequency distribution which is used when data can be placed into specific categories, such as nominal- or ordinal-level data (number of people in each blood type).
Term
Tally
Definition
A count of the number of times a raw data element occurs in each class.
Term
Frequency
Definition
The whole number representing the number of times a raw data element occurs in each class.
Term
Percent
Definition
The percentage of values in each class. - formula is %=f/n*10% (f=frequency of class and n=total number of values)
Term
Frequency Distribution 1
Definition
[image]
Term
Frequency Distribution 2
Definition
[image]
Term
Categorical Frequency Distribution
Definition
[image]
Term
Frequency Percent Calculation
Definition
[image]
Term
Grouped Frequency Distribution
Definition
A frequency distribution which is used when data is large and can can be grouped in units that are more than one unit in width. (a distribution of the number of hours a boat battery lasts)
Term
Grouped Frequency Distribution Graphic
Definition
[image]
Term
Class Limits
Definition
A term used to define the highest and lowest values in a grouped frequency class. (the class limits should have the same decimal place value as the data)
Term
Lower Class Limit
Definition
The smallest data value which can be included in a grouped frequency class.
Term
Upper Class Limit
Definition
The largest data value which can be included in a group frequency class.
Term
Class Boundaries
Definition
The numbers used to separate the classes while preventing gaps created caused by the class limits. (class boundaries should have one additional place value and end in a 5) (Lower limit-0.5= lower boundary / Upper Limit+0.5= upper boundary)
Term
Class Width
Definition
A number for a class frequency distribution found by subtracting the lower (or upper) class limit of one class from the lower (or upper) class limit in the next class. (don not subtract the limits of a single class as it will result in a wrong answer)
Term
Class Width Image
Definition
[image]
Term
Class Midpoint
Definition
[image]
Term
Range
Definition
[image]
Term
Frequency Percent
Definition
[image]
Term
Group Frequency Distribution
Definition
[image]
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