SOLUTION: A doctor at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 95% confident that the true mean is wi
Algebra.Com
Question 508813: A doctor at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 95% confident that the true mean is within 3 ounces of the sample mean? The standard deviation of the birth weights is known to be 7 ounces.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A doctor at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 95% confident that the true mean is within 3 ounces of the sample mean? The standard deviation of the birth weights is known to be 7 ounces.
----
n = [z*s/E]^2
----
n = [1.96*7/3]^2 = 21 when rounded up
=======================================
Cheers,
Stan H.
===========
RELATED QUESTIONS
A doctor at a local hospital is interested in estimating the birth weight of infants. How (answered by Theo)
A nurse at a local hospital is interested in estimating the birth weight of infants. How... (answered by ewatrrr)
a doctor at a local hospital is interested in estimating the birth weight of infants.How... (answered by ewatrrr)
A nurse at a local hospital isinterested in estimating the birth weight of infants. How... (answered by ewatrrr)
a nurse at a local hospital is estimating the weight of infants. how large a sample must... (answered by stanbon)
The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of... (answered by stanbon)
The mean birth-weight for ALL the children born at a certain hospital is 112 oz, and the... (answered by stanbon)
Birth weights at a local hospital have a normal distribution with a mean of 110 oz. and a (answered by ewatrrr)
Birth weights at a local hospital have a normal distribution with a mean of 110 ounces... (answered by ewatrrr)