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# Chapter 2: Organizing Data - PowerPoint PPT Presentation

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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Presentation Transcript

### Chapter 2: Organizing Data

Section 2: Frequency Distribution and Histograms

• Lists the number of occurrences for each category of data

• Categories of data created by using

intervals of numbers

• Usually 5 to 15 classes.

To find the class width…

1. largest data value – smallest data value

desired number of classes

2. Increase result to next whole number

Class Width

within the class.

The largest value

within the class .

Class Limits

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)

Relative Frequency Distribution

• The number halfway between the lower and upper class limits of a class.

To find the class mark…

lower class limit + upper class limit

2

• Histogram- A type of bar graph.

- Horizontal axis represents classes by labeling

the class boundaries

- vertical axis represents frequency or relative

frequency

- no space between bars

·      - bars must be the same width

- width of bar represents a quantitative value,

rather than a category

• the halfway point between the upper limit of one class and the lower limit of the next class

• used as endpoints of the bars in a histogram

Fr equency

frequency

Five Classes

TenClasses

F

F

F

F

F

F

F

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• type of line graph, horizontal axis labeled with class marks, vertical axis represents frequencies