posted by me .
what is the difference between a biased sample and a biased question
A biased sample is not a true sample of the population at large. For instance, a biased sample may include mostly women or mostly people under age 25.
A biased question reflects the questioner's viewpoint. This site gives examples of biased questions.
a biased coin with P(H)=1/4 and P(T)=3/4 is thrown twice, find the probability of getting two heads