Chapter 2 Section 1: Frequency Distribution Flashcards
Ordered array
An ordered list of data from larges to smallest or visa versa
Distribution
A way to describe the structure of a particular data set or population
Frequency distribution
A display of the values that occur in a data set and how often each value, or range of values occurs
Probability distribution
A theoretical distribution used to predict the probabilities of particular data values occurring in a population
Ungrouped frequency distribution
A frequency distribution in which each category represents a single value
Frequency
The number of data values in a category of a frequency distribution
Class
A category of data in a frequency distribution
Grouped frequency distribution
A frequency distribution in which the classes are ranges of possible values.
Class width
The difference between the lower limits or the upper limits of two consecutive classes of a frequency distribution
Lower class limit
The smallest number that can belong to a particular class
Upper class limit
The largest number that can belong to a particular class
Sample size (n)
The sum of all the frequencies in a frequency distribution
Constructing a frequency distribution
1) decide how many classes should be in the distribution
2) choose an appropriate class width
3) find the class limits
4) determine the frequency of each class
Class boundary
The value that lies halfway between the upper limit of one class, and the lower limit of the next class
Midpoint
Lower limit + upper limit divided by 2
