CE 3102
Fall 2008
Thought Problem 18
Left Turns (Again)
A traffic engineer wants to know the fraction of vehicles making a left turn from an
intersection’s westbound approach. During an afternoon peak hour the engineer counts a
total of 215 vehicle’s arriving at this approach, and of these 55 turned left. (a) Compute
the method of moments (MOM) estimate of p? (b) Is this a good estimate? (c) How
accurate is this estimate? (d) Compute the maximum likelihood estimate of p.

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