A health care professional wishes to estimate the birth weights of infants. How large a sample must she select if she desires to be 90% confident that the true mean is within 6 ounces of the sample mean? The standard deviation of the birth weights is known to be 8 ounces.
The question belongs to Statistics and it is about estimating the sample size that can reflect on the entire population. In this case, a healthcare professional wants to know the average birth weight of infants.
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