Mathematics, 14.04.2020 18:02 billy583887
How many students must be randomly selected to estimate the mean weekly earnings of students at one college? We want 95% confidence that the sample mean is within $2 of the population mean, and the population standard deviation is known to be $60.
Answers: 3
![n=[\frac{z_{\alpha/2}\times \sigma }{MOE}]^{2}](/tpl/images/0598/4966/88c73.png)
![=[\frac{1.96\times 60}{2}]^{2}](/tpl/images/0598/4966/f1fe7.png)
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