Question:

What is the minimal sample size needed for a 95% confidence interval to have a maximal margin of of 0.1 in the following scenario?

There is no preliminary estimate for *p*

**Answer:**

1. No preliminary estimate for *p … so **p* = 0.5 for maximum margin.

1.96 (0.5) (0.5)

2. n ≥ __________________

(0.1)2

3. n ≥ 49

4. n = 49

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