Answer
90% confident
Work Step by Step
We are 90% confident that the population proportion of adult Americans, 18 years or older, who have used their smartphones to make a purchase lies between 0.140 and 0.160.
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 9 - Section 9.1 - Assess Your Understanding - Applying the Concepts - Page 437: 25d
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