[See Steps] You want to compute a 95% confidence interval for a population mean. Assume that the population standard deviation is known to be σ=2
Question: You want to compute a 95% confidence interval for a population mean. Assume that the population standard deviation is known to be \(\sigma=2\) and sample size is 70. Find the value of \(z_{\alpha / 2}\) to be used.
Deliverable: Word Document 
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T-test for two Means - Unknown Population Standard Deviations - MathCracker.com