A scientist studying babies born prematurely would like to obtain an estimate for the mean birth weight, u, of babies born during the 24 week of the gestation th period. She plans to select a random sample of birth weights of such babies and use the mean of the sample to estimate u. Assuming that the population of th birth weights of babies born during the 24 week has a standard deviation of 2.6 pounds, what is the minimum sample size needed for the scientist to be 90% confident that her estimate is within 0.4 pounds of µ? 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 a list of formulas.)
A scientist studying babies born prematurely would like to obtain an estimate for the mean birth weight, u, of babies born during the 24th week of gestation period. She plans to select a random sample of birth weights of such babies and use the mean of the sample to estimate u. Assuming that the population of birth weights of babies born during the 24th week has a standard deviation of 2.6 pounds, what is the minimum sample size needed for the scientist to be 99% confident that her estimate is within 0.5 pounds of u? Carry intermediate computations to at least 3 decimal places. Write the answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).
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A scientist studying babies born prematurely would like to obtain an estimate for the mean birth weight, , of babies born during the 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 the week has a standard deviation of pounds, what is the minimum sample size needed for the scientist to be confident that her estimate is within 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).
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