100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Summary Reliability & Validity Simplified and Summarized $4.42
Add to cart

Summary

Summary Reliability & Validity Simplified and Summarized

4 reviews
 617 views  13 purchases
  • Course
  • Institution

Break down of the foundation of understanding reliability and validity.

Preview 2 out of 3  pages

  • January 5, 2017
  • 3
  • 2016/2017
  • Summary

4  reviews

review-writer-avatar

By: laurenscherman • 3 year ago

review-writer-avatar

By: clairenel35 • 5 year ago

review-writer-avatar

By: Heaton • 6 year ago

Great notes, thank you.

review-writer-avatar

By: Siziletnchabeleng • 3 year ago

avatar-seller
Reliability and Validity


Reliability: the consistency with which a measure, measures what it is supposed to
measure.



Two Types of Reliability

 Test-retest Reliability:
 We take the scores from the same group of people on the same test at
different times and correlate them
 The results can be contaminated by the respondents repeated
exposure to the test
 If it is an ability test then the scores will increase
 It can cause faking after awerness of intent of questions
 Candidates can get bored and stop participating.
 Internal Reliability:
 The reliability of the test at a given point in time
 Use the split half reliability test to check internal reliability
 Split the test into two halves and correlate the two
 Most common way to split is to put all even and odd numbered items
together.



Reliability and Error

 Environmental factors such as noise, light and time of day may lead to error in
the reliability of the test
 Also important are the factors within the respondent such as health, mood and
motivation
 Factors in the test also play a role. Wording, scoring, length of test and
ambiguity influence the error
 Ability: if the test is too easy everyone will get high scores
 Language: if the perso doesn’t understand the item they tend to guess

, Creating a reliable scale

 Items must be clear and unambiguous
 The language must be at an appropriate level for the respondent
 Avoid asking too many things at once
 Keep items short and simple
 Avoid negative wording of items



Item Analysis

 Remove items that have low item scale correlations
 Respondents tend to be confused about those items
 You can either fix the item or remove it



Reliability Interpretation

 Reliability varies between 0 – 1
 1 = perfectly reliable
 0 = not reliable
 When decisions are made about people the reliability = 0.85
 Standardized assessments have a reliability of 0.80 – 0.90
 Ability test can have a minimum reliability of 0.85
 A personality test can have a minimum reliability of 0.70
 Higher the reliability the higher the validity



Validity: refers to how well a test measures what it is purported to measure.



Content Descriptive Validity

 Face Validity:
 measure appears to be suitable for the purpose of which the test was
designed

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller PrishaniSingh. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $4.42. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

53022 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$4.42  13x  sold
  • (4)
Add to cart
Added