Question: We have calculated a confidence interval based on a sample of size n = 100. If we want to have a new margin of error

We have calculated a confidence interval based on a sample of size n = 100. If we want to have a new margin of error that is only one third as large, we need to change the sample size to ______. Assume that the other quantities are no affected by the change of the sample size.

Select one:

a. 2500

b. 25

c. 400

d. 900

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