Basic Practice of Statistics (Instructor's)
Basic Practice of Statistics (Instructor's)
8th Edition
ISBN: 9781319057923
Author: Moore
Publisher: MAC HIGHER
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Chapter 22, Problem 22.30E

a.

To determine

To find: The 95% confidence interval for the proportion of drivers who would stop when a neutral expression is maintained.

b.

To determine

To find: The 95% confidence interval for the proportion of drivers who would stop when the assistant is smiling.

c.

To determine

The result obtained in part (a) and part (b) suggests about the effect of a smile on a driver stopping at a pedestrian crosswalk.

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