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What is the minimal sample size needed for a 95% confidence interval to have a maximal...

What is the minimal sample size needed for a 95% confidence interval to have a maximal margin of error of 0.1 in the following scenarios? (Round your answers up the nearest whole number.)

a) If a preliminary estimate for p is 0.35?

b) If there is no preliminary estimate for p?

Math   Statistics-And-Probability   
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