Test item reliability indicates how consistent the results produced from items on a test are. Consistency can refer to the items’ stability over time or the consistency of the items with each other. If an item is unreliable, statistical relationships will be weaker than they really are, and inappropriate conclusions may be drawn regarding the relationships between variables.
A measurement of reliability consists of the extent to which an observed score (which is the true score plus or minus error) accurately reflects the true score. Returning to the example in this week’s Introduction, if your true weight were 150 pounds and you stepped on the scale hundreds of times, it would sometimes show 149, sometimes 152, and sometimes 151. If you averaged all of those weights, you would come close to your true score. If you looked at how much the weights varied, you would have a good measure of the scale’s error. The situation is similar with a psychological test—a score on an IQ test represents an estimate of the theoretical “true” IQ; however, that observed score also includes error.
Researchers or test developers measure a test’s reliability with a reliability coefficient, generally a positive correlation coefficient that is somewhat less than 1.00. (A correlation of 1.00 would indicate perfect correlation, which is theoretically impossible due to inherent error in measurement.) Acceptable reliability coefficients for psychological tests or test items are generally at least .70. If you know a test’s reliability, you can calculate its margin of error, a “plus or minus” band that indicates an interval likely to contain the true score.
For this week’s Discussion, think of a specific testing scenario in an organization. Then consider a reliable test item for that testing scenario and an unreliable item for that same testing scenario. Consider how you might know if these items are reliable or unreliable.
With these thoughts in mind:
Post by Day 4
1. Describe, briefly (one paragraph) a situation in which and organization would use a test (for example, selection, executive coaching, a training situation)
2. Then, describe:
3. Have at least four (4) academic citations (see expectations announcement) drawing from the course readings.
NOTE – Part 2 of the discussion post is NOT easy. An understanding of what makes and item reliable is needed, in order to write a good and a bad item. The readings do not provide easy examples, but instead convey information that will, hopefully, help you understand such items.
An alternative source that might help you understand bad (unreliable) items is:
But use what is gleaned from this (or other sites) to help understand the readings, not as a source cited in the discussion post.
We value our customers and so we ensure that what we do is 100% original..
With us you are guaranteed of quality work done by our qualified experts.Your information and everything that you do with us is kept completely confidential.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.Read more
The Product ordered is guaranteed to be original. Orders are checked by the most advanced anti-plagiarism software in the market to assure that the Product is 100% original. The Company has a zero tolerance policy for plagiarism.Read more
The Free Revision policy is a courtesy service that the Company provides to help ensure Customer’s total satisfaction with the completed Order. To receive free revision the Company requires that the Customer provide the request within fourteen (14) days from the first completion date and within a period of thirty (30) days for dissertations.Read more
The Company is committed to protect the privacy of the Customer and it will never resell or share any of Customer’s personal information, including credit card data, with any third party. All the online transactions are processed through the secure and reliable online payment systems.Read more
By placing an order with us, you agree to the service we provide. We will endear to do all that it takes to deliver a comprehensive paper as per your requirements. We also count on your cooperation to ensure that we deliver on this mandate.Read more