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Bob makes a 95% confidence interval with a random sample of 100 and his margin of error is plus or minus 18. In order to

Bob makes a 95% confidence interval with a random sample of 100 and his margin of error is plus or minus 18. In order to cut the margin of error in half next time, what should Bob's sample size be? (Hint: You CAN determine the answer without knowing the standard deviation.)

A. 400

B. 10,000

C. 200

D. 50

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