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.
If the project-incharge developed a 75-item version by adding similar items, what would be the expected Cronbach alpha?
1
0.700
2
0.824
3
0.875
4
0.931