The Kuder-Richardson 21 formula for estimating the score ...

[Themember4]

The Kuder-Richardson 21 formula for estimating the score reliability of a classroom achievement test has the disadvantage that
 
  a. it is difficult to compute.
  b. it assumes that all test items are of equal difficulty.
  c. it is inappropriate for a power test.
  d. the resulting reliability coefficient must be adjusted by using another formula.

Question 2

Choose the method of estimating score reliability that would be most useful for each of the types of tests listed below. An achievement test to be given as a pretest and a posttest in a classroom research study
 
  a. equivalent forms c. test-retest
  b. split-half

[whitcassie]

Answer to Question 1

B

Answer to Question 2

A

[Themember4]

Thanks for the timely response, appreciate it

[kalskdjl1212]

Gracias!