BASIC PRACTICE OF STATS-LL W/SAPLINGPLU
BASIC PRACTICE OF STATS-LL W/SAPLINGPLU
8th Edition
ISBN: 9781319216245
Author: Moore
Publisher: MAC HIGHER
Question
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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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