# Is a coin fair? [duplicate]

Is a coin fair ? In other words, does a coin come up $50$% heads ? If a coin is unfair, then it would not come up $50$% heads.

My thoughts :

let's first identify the population and the parameter

• This is already answered within this one: stats.stackexchange.com/questions/95643/… – kjetil b halvorsen Feb 13 '15 at 11:13
• this not the same question that i asked – Educ Feb 13 '15 at 11:15
• Yes, it is. The answer of that question applies to yours. – Tim Feb 13 '15 at 11:24
• Which coin are you talking about ? What is the population mentionned in your thoughts ? – Stéphane Laurent Feb 13 '15 at 11:24
• The question itself maybe not the same, but your question is nevertheless answered within the answers to that other question! see the answer byZhang Tschao. Your Q is also answered a lot other times other places here, time to say stop. Search for "you can't bias a coin" here and elsewhere. – kjetil b halvorsen Feb 13 '15 at 11:24