Answer
$n\approx204$.
Work Step by Step
If the margin of error is $\pm7\%$, then our equation is: $\pm\frac{1}{\sqrt n}\cdot 100\%=\pm7\%=\pm0.07\\\frac{1}{\sqrt n}=0.07\\14.29\approx\sqrt{n}\\n\approx204$.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 11 Data Analysis and Statistics - 11.5 Choose the Best Model for Two-Variable Data - 11.5 Exercises - Quiz for Lessons 11.3-11.5 - Page 780: 5
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