In a study on​ infants, one of the characteristics measured was head circumference. The mean head circumference of 12 infants was 34.2 centimeters​ (cm). Assuming that head circumferences for infants...


In a study on​ infants, one of the characteristics measured was head circumference. The mean head circumference of 12 infants was 34.2 centimeters​ (cm).


Assuming that head circumferences for infants are normally distributed with standard deviation 2.3​cm, determine a 90​% confidence interval for the mean head circumference of all infants.


The confidence interval for the mean head circumference of all infants is from 33.1 cm to 35.3 cm. ​(Round to one decimal place as​ needed.)



b. Obtain the margin of​ error, E, for the confidence interval you found in part​ (a).


The margin of error is _____________ cm.

​(Round to one decimal place as​ needed.)




Jun 01, 2022
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