Kim is curious whether heads and tails are really equally probable outcomes when flipping a coin. To test this, she is repeatedly flipping various coins and tracking the results. In the last 50 flips, a quarter has come up heads 24 times.

Construct a 95% confidence interval for the true proportion that this quarter comes up heads.

upper bound'lower

What am I doing wrong?

24/50=0.48

1.645*sq rt 0.48(1-0.48/50= 0.116

0.48-0.116

0.48+0.116