An MSCR project student group sought to investigate whether diabetes-related emergency department (ED) visits, following the implementation of the affordable care act, increased. The group decided to do a power calculation to determine the minimum difference in the proportion of diabetes-related ED visits before and after the implementation of the affordable care act they could detect and found the power to be 0.87. State the null and alternative hypotheses on which the power calculation is based and briefly explain what the power of 0.87 they computed means.

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