Stats: Frequency Table

Define a class on a Frequency Table

1 filled in line on a frequency table including zero classes if they are between filled in lines

Class width on a Frequency Table

(A distance) 1st entry on the second line of a Frequency Table minus the 1st entry on the 1st line of a Frequency Table

5 things that a Frequency Table lists

1- All classes of grouped data 2- Tallies of those classes 3- Frequency of those classes 4- Relative Frequency of those classes 5- Totals of classes, frequency, and relative frequency

5 characteristics of classes on a Frequency Table

1- All data put into classes, a class would be 1 or more numbers 2- Every class represents the same variable 3- Classes never overlap 4- Classes have the same width 5- Number of classes should vary from 4-10 depending on the spread of observations from the data sets

2 main and 4 sub conventions for writing continuous classes on a Frequency Table

1- Continuous classes use inequalities a. 1st inequality starts with a less than or equal to sign b. 2nd inequality starts with a less than sign c. X must be written between signs d. X should always be defined 2- Data may never fall into more than one class

Two Type of Frequency Tables

1- Frequency Table for discrete data with a class width of 1 2- Frequency Table for continuous or discrete data with class width >1

3 conventions for writing discrete classes on a Frequency Table

1- Has class width of 1, no inequalities 2- If class width is >1 use rules for continuous classes 3- data may never fall into more than one class

2 things that must be decided before constructing a Frequency Table

1- Starting point for 1st class 2- Class width determined before tallying

2 Reasons to use a Frequency Table

1- To see how data naturally falls into classes 2- To construct a histogram

How to determine # of classes on a Frequency Table

A count of the number of lines that have been filled in on a Frequency Table including zeros if they are between filled lines

One thing class widths must be

Consistent for all classes in any Frequency Table

Frequency Table

Frequency Distribution Table Not a graph