Chapter 2: Organizing Data. Section 2: Frequency Distribution and Histograms. Frequency Distribution. Lists the number of occurrences for each category of data. Classes. Categories of data created by using intervals of numbers Usually 5 to 15 classes.
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Chapter 2: Organizing Data
Section 2: Frequency Distribution and Histograms
intervals of numbers
The difference between consecutive lower class limits
To find the class width…
1. largest data value – smallest data value
desired number of classes
2. Increase result to next whole number
The smallest value
within the class.
The largest value
within the class .
Upper Class Limit
Lower Class Limit
frequency is listed,
found by dividing the
frequency (f) of each
class by the sum of all
the frequencies (n).
class frequency (f)
total of all frequencies (n)
To find the class mark…
lower class limit + upper class limit
- Horizontal axis represents classes by labeling
the class boundaries
- vertical axis represents frequency or relative
- no space between bars
· - bars must be the same width
- width of bar represents a quantitative value,
rather than a category