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What is the minimal sample size needed for a 95% confidence interval to have a maximal margin of error of0.1in the following scenarios? (Round your

What is the minimal sample size needed for a 95% confidence interval to have a maximal margin of error of0.1in the following scenarios? (Round your answers up the nearest whole number.)

(a) a preliminary estimate forpis0.22

(b) there is no preliminary estimate forp

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