Use a p-value to make a decision about whether a coin is fair (i.e. the probability of tossing a head is 50%).
This tool consists of two 'views': the investigate view and the test view. Use the button at the bottom
to move between views.
Investigate viewUnder the investigate view, use the radio buttons to choose to flip a fair coin or a biased coin. The probability of tossing heads is displayed. Using the buttons to flip the coin, you can observe the results of the coin tosses under the indicated probability of tossing a head.
In the test view, the probability of heads is initially unknown. You are asked to either "accept" or "reject" the hypothesis that the coin is fair. To guide your decision, gather information about the coin by tossing it. The applet displays the results of the tosses with the probability of getting at most the observed number of heads if the coin is fair. Once you accept or reject the hypothesis, the true probability of tossing a head is revealed.Activity: Devise a plan to determine whether or not the coin is fair: