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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? (For each answer, enter a number. Round your answers up the nearest whole number.) (a) a preliminary estimate for p is 0.23 (b) there is no preliminary estimate for p

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