An airport bus driver conducted a study to see what proporti

An airport bus driver conducted a study to see what proportion of customers use the shuttle bus to get to and from the parking lot. The results of his study are listed below, where B = customer used the bus and W = customer walked.

B B B W W B B W W W

W B B B B B W B B B

W W B B B B W B W B

W W B B W W B W W B

B B B B B B B W

Construct a 90% confidence interval for p, the true proportion of all people who used the bus. What is the lower confidence limit for p?

Solution