biased
Correct spelling
biassed
Incorrect spelling
baiased
Incorrect spelling
biasd
Incorrect spelling
baised
Incorrect spelling
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Past tense of bias in UK English can be biassed, in US English it’s always biased. Biased as an adjective never has a double s.
I’m pretty sure biassed is not incorrect in UK English. (Google seems to think biased is wrong in UK English, which surprised me as an Australian where I mostly follow UK spelling, but would not have spelled baised with ss.)