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The estimate of the population proportion is to be within plus or minus .05, with a 95% level of confidence. The best estimate of the

The estimate of the population proportion is to be within plus or minus .05, with a 95% level of confidence. The best estimate of the population proportion is .15. How large a sample is required? (Round up your answer to the next whole number.)

Sample size (I calculate 384 for the sample size, but that's not accepted as correct, how do I calculate this? - please)

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