Statistics Frequency Table Test Review

1. The starting point of the first class 2. The class width before tallying begins

2 things that must be decided before constructing a frequency table

1. Data is put in classes- a class could be one number or more than one number. 2. Each class represents the same variable. 3. Classes are never overlapping. 4. Classes all have the same width. 5. The number of classes should vary from 4 to 10, depending on the spread of the data set.

5 characteristics of classes on a frequency table

A frequency distribution table for quantitative data lists, in table format, the following: 1. All the classes of grouped data. 2. Tallies of those classes 3. Frequencies of those classes 4. Relative frequencies of those classes (%). 5. Grand total of the number of classes, frequencies, and relative frequencies.

5 things that frequency tables list

A statistical record of how often each value in a data set occurs for quantitative data, including classes, frequencies, relative frequencies, and tallying

Frequency table

The number of classes is the count of the number of lines that have been filled in on a frequency table, including zeroes if they are between filled-in lines.

How to determine the number of classes on a frequency table

Class widths must be consistent for all classes on a frequency table. Always expressed as an inequality.

One thing class widths must always be

1. Frequency tables for discrete data whose class width is one. 2. Frequency tables for continuous data or discrete data with a class width greater than one.

Two types of frequency tables.

Histograms

What frequency tables enable constructing

1. When quantitative variables take on so many values that a graph of a distribution is clearer if nearby values are grouped together. 2. When you want to draw a histogram

Why use a frequency table

A class is one filled-in line on a frequency table including zeroes if they are between filled-in lines.

Class on a frequency table

A class width is the distance from the first entry of the second line of the frequency table minus the first entry on the first line of the frequency table.

Class width

1. Continuous classes use inequalities. a. The first inequality is always and less than or equal to sign. b. The second inequality is always a less than sign. c. And x is written between the two signs. d. X should be defined 2. Data may never fall into more than one class

Conventions for continuous classes

1. Inequalities are not required when the class width is one. 2. If the class width is greater than one, use the rules for continuous classes 3. Data may never fall into more than one class

Conventions for discrete classes