In a study on infants, one of the characteristics measured was head circumference. The mean head circumference of 9 infants was 34.9 centimeters (cm). Complete parts (a) through (d) below. Click here to view Page 1 of the table of areas under the standard normal curve. Click here to view Page 2 of the table of areas under the standard normal curve. a. Assuming that head circumferences for infants are normally distributed with standard deviation 2.4 cm, determine a 95% confidence interval for the mean head circumference of all infants. cm to cm. (Round to one The confidence interval for the mean head circumference of all infants is from c decimal place as needed.)

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