Mathematics, 14.06.2020 00:57, sophiagardens227
How's the economy? A pollster wants to construct a confidence interval for the proportion of adults who believe that economic conditions are getting better. Part: 0 / 20 of 2 Parts Complete Part 1 of 2 (a) A poll taken in July estimates this proportion to be . Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of ? A sample of adults is needed to obtain a confidence interval with a margin of error of .
Answers: 1
![n = [\frac{z_c}{e} ]^2 * \r p(1- \r p)](/tpl/images/0685/5848/d166c.png)
![n = [\frac{1.96}{0.03} ]^2 * 0.33 (1- 0.33)](/tpl/images/0685/5848/29a0e.png)
![n_b = [\frac{z_c}{e} ]^2 * \r p(1- \r p)](/tpl/images/0685/5848/25b05.png)
![n_b = [\frac{1.96}{0.03} ]^2 * 0.50 (1- 0.50)](/tpl/images/0685/5848/fa757.png)
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How's the economy? A pollster wants to construct a confidence interval for the proportion of adults...
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