1 / 5

Validity and Reliability

Validity and Reliability. Example of Past Paper Answer – 2007 Q6. Definitions – Reliability.

isabelle-rowen
Download Presentation

Validity and Reliability

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. Validity and Reliability Example of Past Paper Answer – 2007 Q6

  2. Definitions – Reliability • Definition: Reliability is the consistency of your measurement, or the degree to which an instrument measures the same way each time it is used under the same condition with the same subjects. In short, it is the repeatability of your measurement. A measure is considered reliable if a person's score on the same test given twice is similar.

  3. Definitions – validity • Truthfulness: Does the test measure what it purports to measure? the extent to which certain inferences can be made from test scores or other measurement. (Mehrens and Lehman, 1987) • The degree to which they accomplish the purpose for which they are being used. (Worthen et al., 1993)

  4. Evidence for valid and reliable • the survey has been carried out by an independent body (MORI) • carried out on behalf of a reputable foundation • the sample size was fairly large (c 2000) • asks a wide range of perception questions that gauge public opinion well • the survey was carried out over 3 years, so trends can be identified • fairly recent research.

  5. Evidence against valid and reliable • “representative sample of British residents” – no information about sample other than that • percentages – some add up to over 100, some to less, with no explanation offered to explain these anomalies • no information on the details of the survey eg location, social background of the respondents, etc • the unclear instruction about how many to choose from.

More Related