Portage Math 110 Elementary Statistics
(Module 2)
Frequency distribution - Verified Answer A tabular summary of data showing the
number (frequency) of observations in each of several distinctive (no overlapping)
categories or classes.
Relative frequency - Verified answer a ratio that compares the frequency of each
category to the total.
Frequency of the class / n where n = total count of all classes
Relative percentage - Verified Answer percentage of time the value occurs in the
sample or population
Relative frequency x 100
Charting - Verified Answer means to represent frequencies visually
Column chart - Verified Answer Data graphed as a series of vertical bars
X-axis: class
Y-axis: frequency of class
Bar chart - Verified Answer Data graphed as a series of horizontal bars
X-axis: frequency of class
Y-axis: class
Pie chart - Verified Answer chart that shows the relationship of a part to a whole
Best suited for the distributions focused on the proportions
3 step method to group numerical data into classes - Verified Answer1. Determine the
number of classes to be evaluated
2. Determine the width of each class
3. Determine the limits of each class
Number of classes - Verified Answer (use b/w 5 and 20)
Less than 25 > 5 to 6
25 to 50 > 7 to 14
More than 50 > 15-20
Width of class - Verified Answerapprox width =
(Largest data value - smallest data value) / # of classes
Qualitative data - Verified Answer frequency distributions
Relative frequency distributions
