Comprehension Passage
Read the following paragraph and answer the five questions, which follows: A leading business school in the city had a view that its students must have a good proficiency in English language usage. As an initial step, the school authorities decided to develop a brief language usage test. The project incharge wrote 30 items. Each item had five alternative answers, one of which was correct. He administered these 30 items to a sample of 250 students. For item analysis, item-remainder correlations were computed. The item analysis retained 25 items. The twenty-five item version was administered to a fresh sample of 300 students. Three reliability coefficients were computed split half reliability coefficient. Kuder-Richardson (K-R) reliability coefficient, and Cronbach alpha were computed. The Cronbach alpha was found to be 0.7. The test-retest reliability was also computed with a time-interval of eight weeks in two administrations, using the same sample. The test-retest correlation was found to be 0.26, significant at .001 level. The school authorities, pleased with the efforts of the project incharge, asked him to add similar items and develop a 75 item version.
Consider the three reliability coefficients : (a) split-half reliability coefficient; (b) K-R reliability coefficient; and (c) Cronbach alpha - computed in the above study.
Which one the following is true in the above context?
1
All the three reliability coefficients would be same
2
All the three reliability coefficients would be different
3
(b) and (c) would be same, but (a) can be different
4
(a) and (c) would be same, but (b) can be different