Question

Fill in the Blank

13.1. When we use a reliable instrument over and over, we expect to get the same __________ each time we use that instrument.

13.2. The consistency of scores obtained for the same group of people upon repeated measures is an indication of the instrument's _____________.

13.3. To assess the test-retest reliability of an instrument, the statistical test of ______________is used.

13.4. The two components that make up an observed score are the true score and a(n) _______ score.

13.5. One way to assess a test reliability is to ____________ two alternate forms of the test with each other.

13.6. The Spearman Brown Prophecy formula is used to calculate the reliability of a full-length test by first calculating the ____________ between the two split halves.

13.7. When a person has a score of 85 and the test has a standard error of estimate (SEM) of 5, it means that 68% of the time the person's true score is expected to be between the scores of_____ and _____.

Answer #1

13.1- **Result**

Reliability implies the consistency,for example if you take ACT
six times then roughly you get the same *Result each time
.*

13.2- **Reliability**

Reliability is measure of the stability or consistency of the test scores.For example, a medical thermometer is a reliable tool that would measure the correct temperature each time it is used.

13.3- **Correlation**

Test-Retest Reliability (sometimes called retest reliability)
measures test consistency — the reliability of a test measured over
time. For measuring reliability for two tests, use the Pearson
Correlation Coefficient.If you have more than two tests, use
Intraclass Correlation.

13.4- **Error**

It is a theory of testing based on the idea that a observed or obtained score on a test is the sum of a true score and an error score.

13.5- **Compare**

To determine the coefficient for this type of reliability, the same test is given to a group of subjects on at least two separate occasions. If the test is reliable, the scores that each student receives on the first administration should be similar to the scores on the second. We would expect the relationship between he first and second administration to be a high positive correlation.

13.6- **Correlation**

The Spearman-Brown Prediction Formula, also known as the Spearman-Brown Prophecy Formula or Correction, is a method used in evaluating test reliability.In split-half reliability, where we split the test into two halves (first/last, even/odd, or random split) and then correlate scores on each.

13.7- **80 and 90**

Using the formula:

68%CI = Score ±SEM

(85– 5) = 80

(85 + 5) = 90.

The person’s true score lies between 80 and 90.

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