Chapter 3.4 Flashcards
A __________ ___________ summarizes data into classes and provides in tabular form a list of the classes along with the number of observations in each class.
Frequency Distribution
There are only 2 steps in the construction of a frequency distribution.
1) choose the number of classifications
2) count the number in each class
What are the 2 requirements that should be met when setting up the categories for classification?
1) mutually exclusive
2) exhaustive
(Categories should not overlap and should cover all possible values.)
Basic class width formula
Largest value - Smallest value
Class width= ————————————————-
Number of classes
What is the smallest number that can belong to a particular class?
Lower class limit
What is the largest number that can belong to a class?
Upper class limit
The __________ ___________ is the difference between the lower limits or upper limits of 2 consecutive classes of a frequency distribution.
Class width
A _________ ________ is the value that lies halfway between the upper limit of one class and the lower limit of the next class.
Class boundary
The ________, or class mark, of a class is the sum of the lower and upper limits of the class divided by 2.
Midpoint
Class midpoint formula
Lower limit + upper limit
Class midpoint = ————————————-
2
The _________ __________ distribution enables the reader to view the number in each category in relation to the total number of observations.
Relative frequency
Relative frequency formula
Number in class
Relative frequency= ———————————————
Total number of observations
The __________ __________ is the sum of the frequency of a particular class and all preceding classes.
Cumulative frequency
The _________ __________ frequency is the proportion of observations in a particular class and all preceding classes.
Cumulative relative
