Actually, i'm thinking this not just in terms of the scores but i do realise there are many, myself included who seem to have a preference for a certain function group. Like i mentioned a preference for Ti and Te. Apparently, i'm not the only one and i heard it was common for thinkers.Do you think all people are aware of how they truly are and answer the questions on the test to correspond exactly to their true personality?
I have this friend who is so Fi and Fe that i wasn't sure which one was she. Turns out she's Fi tertiary but with a strangely high Fe.
Sometimes, it might be very likely for someone to answer their tests in a biased manner. So maybe the answer is yes, we might be more likely to be biased in answering questions in tests.
I did this experiment once and asked a few friends/family on what they thought of me as a fun survey. Some of their answers were the total opposite of myself (quite ESFP lol) but it really was an eye opening experience. This is something like the Johari's window.