Mathematics, 02.12.2020 17:10 Shaynele
A professor at a university wants to estimate the average number of hours of sleep the students get during exam week. The professor wants to find a sample mean that is within 4.266 hours of the true average for all college students at the university with 99% conconfidence. If the professor knows the standard deviation of the sleep times for all college students is 2.539, what sample size will need to be taken
Answers: 1
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![n = [\frac{Z_{\frac{\alpha }{2} } * \sigma }{E} ] ^2](/tpl/images/0941/6160/a50a9.png)
![n = [\frac{2.58 * 2.539 }{4.266} ] ^2](/tpl/images/0941/6160/ea170.png)
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