15. In Norway, the distribution of birth weights for full-term infants whose gestational is 40 weeks is approximately normal with mean u= 3500 grams and standard deviation o = 430 grams [19]. An investigator plans to conduct a study to deter- age

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So the formula I was told to use was 

n=sigma squared/delta squared times (z alpha/2 + z beta) squared

I have the formula but im not sure how to use it. 

15. In Norway, the distribution of birth weights for full-erm infants whose gestational
age is 40 weeks is approximately normal with mean u = 3500 grams and standard
430 grams [19]. An investigator plans to conduct a study to deter-
deviation o =
Transcribed Image Text:15. In Norway, the distribution of birth weights for full-erm infants whose gestational age is 40 weeks is approximately normal with mean u = 3500 grams and standard 430 grams [19]. An investigator plans to conduct a study to deter- deviation o =
Bibliography
257
mine whether the birth weights of full-term babies whose mothers smoked through-
out pregnancy have the same mean. If the true mean birth weight for the infants
whose mothers smoked is as low as 3200 grams (or as high as 3800 grams), the in-
vestigator wants to risk only a 10% chance of faíling to detect this difference. A
two-sided test conducted at the 0.05 level of significance will be used. What sam-
ple size is needed for this study?
Transcribed Image Text:Bibliography 257 mine whether the birth weights of full-term babies whose mothers smoked through- out pregnancy have the same mean. If the true mean birth weight for the infants whose mothers smoked is as low as 3200 grams (or as high as 3800 grams), the in- vestigator wants to risk only a 10% chance of faíling to detect this difference. A two-sided test conducted at the 0.05 level of significance will be used. What sam- ple size is needed for this study?
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