Chapter 2 organizing data
1 / 19

Chapter 2: Organizing Data - PowerPoint PPT Presentation

  • Uploaded on

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.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Chapter 2: Organizing Data' - badu

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Chapter 2 organizing data

Chapter 2: Organizing Data

Section 2: Frequency Distribution and Histograms

Frequency distribution
Frequency Distribution

  • Lists the number of occurrences for each category of data


  • Categories of data created by using

    intervals of numbers

    • Usually 5 to 15 classes.

Class width

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

Class Width

Class limits

The smallest value

within the class.

The largest value

within the class .

Class Limits

Upper Class Limit

Lower Class Limit

Relative frequency distribution

the relative

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

Class mark mid point
Class Mark (Mid-Point)

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

    To find the class mark…

    lower class limit + upper class limit


Graphic representations of grouped frequency distributions
Graphic representations of (Grouped) Frequency Distributions

  • Histogram- A type of bar graph.

    - 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

Class boundary
Class Boundary

  • 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

Chapter 2 organizing data

Three Classes

Fr equency

Histogram examples cont
Histogram Examples (Cont).


Five Classes










Frequency polygon
Frequency Polygon

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