Read the following paragraph and answer the give questions which follow:

A psychologist wanted to develop an achievement test in Chemistry for SSC students of central schools. For this purpose, he wrote 110 items having multiple-choice format. He administered this draft version to a sample of 300 subjects. Item analysis was carried out by computing item-remainder correlations. The item analysis retained 80 items. The eighty-item version was administered to a fresh sample of 400 subjects which yielded a mean of 40.00 and standard deviation of 8.00. The scores were found to be normally distributed. Cronbach alpha for eighty-item version was found to be 0.94. The psychologist also computed odd-even reliability and Kuder-Richardson (K-R) reliability for this version. On this version, one of the subject Manas, had a sorce of 32. Since the eighty-item version was considered long for administration two forms, from A and Form B were prepared by randomly assigning 40 items to each form.