Chapter 2
If several frequency distributions are constructed from the same data set, the distribution with the widest class width will have the
Fewest classes
Sum of all frequencies for all classes will always equal
Sample Size
In a cumulative frequency distribution, the last class will always have a cumulative frequency equal to
sample size
A cumulative relative frequency distribution shows
the proportion of data items with values less than or equal to the upper limit of each class
Stem and Leaf Chart
A graphical display used to show simultaneously the rank order and shape of a distribution of data
Frequency
Count
Relative Frequency
Frequency of the class / Sample size
In constructing a frequency distribution, as the number of classes are decreased, the class width
Increases
The sum of all relative frequencies for all classes will always equal
One
The sum of frequencies for all classes will always equal
The # of elements in a data set
Class width
The difference between the lower class limits of adjacent classes
cumulative frequency distribution
The total number of data items with a value less than the upper limit for the class is given by the
The sum of the percent frequencies for all classes will always equal
100
In a cumulative % frequency distribution, the last class will have a cumulative % frequency equal ton
100%
Cross Tabulation
A tabular method that can be used to summarize the data on two variables simultaneously
Relative frequency distribution
A tabular summary of a set of data showing the fraction of the total number of items in several classes
Relative Frequency Distribution
A tabular summary of data showing the fraction or proportion of observations in each of several non overlapping categories or classes
Frequency Distribution
A tabular summary of data showing the percentage of observations in each of several non overlapping categories
Percent Frequency Distribution
A tabular summary of data showing the percentage of observations in each of several non overlapping classes
Cumulative Relative Frequency Distribution
A tabular summary of quantitive data showing the fraction or proportion of data values that are less than or equal to the upper class limit of each class
Cumulative Frequency Distribution
A tabular summary of quantitive data showing the number of data values that are less than or equal to the upper class limit of each class
Cumulative Percent Frequency Distribution
A tabular summary of quantitive data showing the percentage of data values that are less than or equal to the upper class limit of each class