Question: The lowest and highest observations in a population are 20 and 80, respectively. What is the minimum sample size n required to estimate with

The lowest and highest observations in a population are 20 and 80, respectively. What is the minimum sample size n required to estimate µ with 80% confidence if the desired margin of error is E = 2.6 ? What happens to n if you decide to estimate µ with 95% confidence?

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