Mathematics, 20.11.2020 14:00 mxdv
You are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on constructing a confidence interval; however, you are not sure how many citizens should be included in the sample. If you want your sample estimate to be within 5 years of the actual mean with a confidence level of 94%, how many citizens should be included in your sample? Assume that the standard deviation of the ages of all the citizens in this community is 22 years.
Answers: 3
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![n = [\frac{Z_{\frac{\alpha }{2} } * \sigma }{E} ] ^2](/tpl/images/0917/2006/a50a9.png)
![n = [\frac{1.881 } * 22 }{5} ] ^2](/tpl/images/0917/2006/8a335.png)
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