Question: A random sample of 125 observations yields a confidence interval with a margin of error of 60. In a new study we would like to

A random sample of 125 observations yields a confidence interval with

A random sample of 125 observations yields a confidence interval with a margin of error of 60. In a new study we would like to estimate the same population parameter with a margin of error of 20 (a third of the old margin of error). How many observations should we sample for this new study

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