Question: What is the minimum sample size n required to estimate with 90% confidence if the desired margin of error is E = 1.2 ?

What is the minimum sample size n required to estimate µ with 90% confidence if the desired margin of error is E = 1.2 ? The population standard deviation is estimated as = 3.5. What happens to n if the desired margin of error decreases to E = 0.7?

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