A medical staff who knows statistics is concerned with the weights of babies. What's the minimum sample size needed to be 97% confident that the true mean is within 2.3 ounces of the sample mean? The standard deviation of the weights is known to be 7.3 ounces.
Added by Teresa M.
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03. To find the corresponding z-score, we can use a standard normal distribution table or calculator. The z-score for a 97% confidence level is approximately 1.88. Show more…
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