frequency distributions n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Frequency distributions PowerPoint Presentation
Download Presentation
Frequency distributions

Loading in 2 Seconds...

  share
play fullscreen
1 / 9
zudora

Frequency distributions - PowerPoint PPT Presentation

131 Views
Download Presentation
Frequency distributions
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

  1. Frequency distributions Chapter 2

  2. What are frequency distributions? • Table or graph that lets you quickly and easily see how many responses of a particular value (or range of values) you have

  3. Why do we care? • Lets you quickly and easily see if you have invalid values • Lets you quickly and easily see where participants are • Consistent with who recruited – e.g., if newlyweds, should have high levels of satisfaction, and short levels of length of marriage

  4. Table • One column has possible values of variable, grouped or ungrouped • Another has number of people with that value (or range of values) • Another may have percentage or proportion of people with that value (or range of values)

  5. Graphs • Regardless of type of frequency distribution graph: • Value of variable on X axis • Frequency of that value on Y axis

  6. Histogram • Used for quantitative variable • Bar for each possible value of variable • No space between bars • Height of bar = number of people with that value

  7. Bar graph • Same idea as histogram, but used for qualitative variables • To reinforce this, space between bars on graph

  8. Polygon • Think of shape – created from dots and connecting lines • Dot placed at height corresponding to number of people with a particular value • Repeated for each possible value • Dots connected

  9. Types of distributions • Symmetrical • Skewed • Positive/to the right • Negative/to the left • Named by where the tail is