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OpenStudy (anonymous):
I keep getting a conflicting answer from my instructors answer key on a question: a standardized test has a mean of 104, a standard deviation of 16. We need to be at least 98% certain that we are within 4 points of the true mean. Determine the required sample size. The answer key says that the answer is 87, but I keep coming up with different numbers and can't figure out what I'm doing wrong.
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