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## Homework Statement

What formula do I need to find the confidence interval, when I have got:

- Number of samples

- Level of Confidence

- The assumed (1st guess) accuracy

## Homework Equations

I found the following equation online: µ = z * [p * (1 - p) / n] ^ (-1/2)

## The Attempt at a Solution

When I fill in this formula, I get µ = 125.5, while I think the confidence interval should be around 3 percent.