Chen, Dai, and Dong (2008) measured the relationship between scores on a revised version of the Aitken Procrastination Inventory (API) and actual procrastination among college students. Higher scores on the API indicate greater procrastination. They found that procrastination (Y) among college students could be predicted by API scores (X) using the following regression equation: Ŷ = 0.146X - 2.922. Estimate procrastination when:
a. X = 30
b. X = 40
c. X = 50