# Using a webcam, a traffic analyst selected a random sample of 800 cars traveling on I-195 in Miami on a

## Question:

Using a webcam, a traffic analyst selected a random sample of 800 cars traveling on I-195 in Miami on a weekday morning. Among the 800 cars in the sample, 24% were white. The margin of error for this estimate is 3.0 percentage points.

a. Would you be surprised if a census revealed that 26% of cars on I-195 in Miami on a weekday morning were white? Explain your answer.

b. Explain how the traffic analyst could decrease the margin of error.

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**4**Section: Exercises

Problem: 96

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