Interval for One Sample Continuous Outcome An investigator wants to estimate the mean birth weight of infants born full term to mothers who are 19 years of age or younger The mean birth weight of infants born full term to mothers 20 years of age and older is 351Qg with a standard deviation of 385g A. How many women 19 years of age or younger must be enrolled in the study to ensure that a 95% confidence interval estimate of the mean birth weight of their 196 infants has a margin of error not exceeding 100g? B. How many do you need if 5% deliver pre-term? ONES & BARTLETT LEARNING 2011 Jones & Bartlett Learning, LLC

Question

Problem 1 

Interval for One Sample Continuous Outcome
An investigator wants to estimate the mean birth weight of infants born
full term to mothers who are 19 years of age or younger
The mean birth weight of infants born full term to mothers 20 years of
age and older is 351Qg with a standard deviation of 385g
A. How many women 19 years of age or younger must be enrolled in the study to
ensure that a 95% confidence interval estimate of the mean birth weight of their
196
infants has a margin of error not exceeding 100g?
B. How many do you need if 5% deliver pre-term?
ONES & BARTLETT LEARNING
2011 Jones & Bartlett Learning, LLC

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Interval for One Sample Continuous Outcome An investigator wants to estimate the mean birth weight of infants born full term to mothers who are 19 years of age or younger The mean birth weight of infants born full term to mothers 20 years of age and older is 351Qg with a standard deviation of 385g A. How many women 19 years of age or younger must be enrolled in the study to ensure that a 95% confidence interval estimate of the mean birth weight of their 196 infants has a margin of error not exceeding 100g? B. How many do you need if 5% deliver pre-term? ONES & BARTLETT LEARNING 2011 Jones & Bartlett Learning, LLC

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