Chapter 2: Descriptive Statistics: Tabular and Graphical Methods

A tabular summary of a set of data, which shows the frequency of the appearance of data elements in several nonoverlapping classes is termed
1. the class width
2. a frequency polygon
3. a frequency distribution
4. a histogram
5. none of the above
A tabular summary of a set of data showing classes of the data and the fraction of the items belonging to each class is called
1. the class width
2. a relative fequency distribution
3. a cumulative relative frequency distribution
4. an ogive
5. none of the above
A histogram is
1. a graphical presentation of a frequency or relative frequency distribution
2. a graphical method of presenting a cumulative frequency or a cumulative relative frequency distribution
3. the history of data elements
4. none of the above
The length of the interval forming a class is called
1. the class midpoint
2. the lower class limit
3. the upper class limit
4. the class width
5. none of the above
A graphical method of presenting qualitative data by frequency distribution is termed
1. a frequency polygon
2. an ogive
3. a bar graph
4. none of the above
The sum of frequencies for all classes will always equal
1. 1
2. the number of elements in a data set
3. the number of classes
4. a value between 0 to 1
5. none of the above
The relative frequency of a class is computed by
1. dividing the midpoint of the class by the sample size
2. dividing the frequency of the class by the midpoint
3. dividing the sample size by the frequency of the class
4. dividing the frequency of the class by the sample size
5. none of the above
If several frequency distributions are constructed from the same data set, the distribution with the narrowest class width will have the
1. fewest classes
2. most classes
3. same number of classes as the other distributors since we are all constructed from the same data
4. none of the above
In a cumulative relative frequency distribution, the last class will have a cumulative relative frequency equal to
1. one
2. zero
3. the total number of elements in the data set
4. none of the above
A tabular method that can be used to summarize the data on two variables simultaneously is called
1. simultaneous equations
2. an ogive
3. a histogram
4. crosstabulation
5. none of the above