Throwing darts at a map to decide in which states to sample would bias in favor of geographically large states.Interviewing people cheching out of the hospital would bias in favor of patients with short stays,since due to costs ,Having each student pick one coin out of a bag of 1000 coins to help estimate the total monetary value of the coins in the bag would bias in favor of coins , for example ,quarters over dimes.
老大,你这是机器翻译吧,不合格,根本不是汉语。