Question: When we build a confidence interval, we are estimating the population mean based on a sample we have taken from the population. To use the

When we build a confidence interval, we are estimating the population mean based on a sample we have taken from the population. To use the z distribution, we must know sigma, the population standard deviation. In real world applications sigma is rarely given. In real world applications, we must provide this value. In what ways can we estimate the population standard deviation?

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