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