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This question already has an answer here:

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

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marked as duplicate by kjetil b halvorsen, Tim, Stéphane Laurent, mpiktas, Nick Cox Feb 13 '15 at 11:34

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ This is already answered within this one: stats.stackexchange.com/questions/95643/… $\endgroup$ – kjetil b halvorsen Feb 13 '15 at 11:13
  • $\begingroup$ this not the same question that i asked $\endgroup$ – Educ Feb 13 '15 at 11:15
  • $\begingroup$ Yes, it is. The answer of that question applies to yours. $\endgroup$ – Tim Feb 13 '15 at 11:24
  • $\begingroup$ Which coin are you talking about ? What is the population mentionned in your thoughts ? $\endgroup$ – Stéphane Laurent Feb 13 '15 at 11:24
  • $\begingroup$ 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. $\endgroup$ – kjetil b halvorsen Feb 13 '15 at 11:24