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

Refer to Shuttle Bus Study Narrative. Construct a 90% confidence interval forp, the true proportion of all people who used the bus.