A coin is flipped 10 times and comes up heads 9 times. You have reason to suspect

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A coin is flipped 10 times and comes up heads 9 times. You have reason to suspect however, that the coin produces an excess of heads (and have told this to a friend in advance).
Using the above data, find the p-value associated with the null hypothesis that the true probability of heads is 0.5. Is the result significant?
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