Reliability

Question 1

What is reliability?

Answer 1

Reliability looks at whether a test yields the same accurate for a test.

Question 2

what does the test score theory assume?

Answer 2

an individual has a true score, assuming that there is no measurement error.

Question 3

what are the four assumptions in Classical test Theory?

Answer 3

1. An individual’s true score would be obtainable if there was no error in measurement.
2. There is error in measurement, and the error is random
3. an individual’s true score does not change with repeated application of the same test, the observed score does change.
4. the distribution of random errors will be the same for all age groups.

Question 4

Name the types of reliability

Answer 4

1. Test-retest reliability
   testing the same construct at two different times, and then looking at co-efficient of stability
2. Parallel forms reliability
   testing the individual on two different forms of the same test, and then looking at the coefficient of equivalence
3. internal consistency reliability
   looks at whether the items in one test all measure the same thing
4. Inter-rater reliability
   measures how consistently two or more raters agree

Question 5

What is internal consistency reliability?

Answer 5

looks at whether all items within a test measure the same thing

Question 6

what are the different types of internal consistency reliability?

Answer 6

1. Split-half reliability
   a test is split in half, total scores from each half are correlated
2. Kuder-Richardson 20 reliability
   is a measure reliability for a test with binary variables, it is used for items that have varying difficulty
3. Cronbach’s Alpha
   estimates the consitstency of responses to different scale items, is calculated by using the in inter-item variance and covariance

Question 7

what is the standard error of measurement?

Answer 7

it is how much, on average, the observed score on a test differs from the true score