Question: What is the minimum sample size required to provide a 95% confidence interval for a mean if we want to be no more than 1.25

What is the minimum sample size required to provide a 95% confidence interval for a mean if we want to be no more than 1.25 cm off? You may assume that the population is normal with standard deviation of 4 cm. (Za/2= 1.96)

110

630

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