1 / 9

Asking Good Questions

Asking Good Questions. Chapter 7. Scales of Measurement. Nominal Ordinal Interval Ratio. Nominal Level Data. Identification Examples: Mode. Source: packers.wikia.com. Ordinal Level Data. Order Examples: Median. Source: collegefootballpoll.com. Interval Level Data.

deweyj
Download Presentation

Asking Good Questions

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Asking Good Questions Chapter 7

  2. Scales of Measurement • Nominal • Ordinal • Interval • Ratio

  3. Nominal Level Data • Identification • Examples: • Mode Source: packers.wikia.com

  4. Ordinal Level Data • Order • Examples: • Median Source: collegefootballpoll.com

  5. Interval Level Data • Can compare based on size of differences among and between members • Examples: • Mean Source: en.wikipedia.org

  6. Ratio Level Data • Absolute zero and comparison of absolute magnitudes • Examples: • Mean Source: www.iruler.net

  7. Measuring Attitudes • Self-reports • Itemized-Rating Scales • Likert-scales • Semantic differential scales • Graphic rating scales • Comparative rating scales • Constant sum scale • Halo effect

  8. Other Considerations • Number of Items • Global measures • Composite measures • Number of Scale Positions • Include “Don’t Know” or “N/A”??

  9. Establishing Validity & Reliability • Two types of errors • Systematic error • Random error • Validity • “Extent to which differences in scores on an instrument measure true differences among individuals on the characteristic it intends to measure” • Reliability

More Related