# Chapter 11 Data Analysis and Statistics - 11.4 Select and Draw Conclusions from Samples - 11.4 Exercises - Skill Practice - Page 770: 15

1111

#### Work Step by Step

We use the margin of error equation to find: $$margin\ of \ error =\times \frac{1}{\sqrt{n}}\\ n=(margin\ of \ error)^{-2} \\ n=(.03)^{-2} \\ n=1111$$

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