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1a. How large a sample should you take to estimate the mean of a population within plus or minus 1.0 with 95% confidence the standard

1a. How large a sample should you take to estimate the mean of a population within plus or minus 1.0 with 95% confidence the standard deviation is estimated to be 0.1?

b. How large a sample should you take to estimate the mean of a population within plus or minus 0.2 with 98% confidence the standard deviation is estimated to be 0.1?

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