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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