Question
A scientist studying babies born prematurely would like to obtain an estimate for the mean birth weight, , of babies born during the24 th week
A scientist studying babies born prematurely would like to obtain an estimate for the mean birth weight,
, of babies born during the24
th
week of the gestation period. She plans to select a random sample of birth weights of such babies and use the mean of the sample to estimate
. Assuming that the population of birth weights of babies born during the24
th
week has a standard deviation of2.7
pounds, what is the minimum sample size needed for the scientist to be95
%
confident that her estimate is within0.4
pounds of
?
Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).
(If necessary, consult alist of formulas.)
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