# Math Help - Confidence Intervals...

1. ## Confidence Intervals...

To test a coin for fairness (equal likelihood of heads and tails a flip), a coin is flipped 100 times with the result that heads came up 56 times. What is the 95% confidence interval for such an experiment?

2. most people would use a normal approximation

$\hat p\pm 1.96\sqrt{{\hat p\hat q\over n}}$

where n=100 and $\hat p =.56$