In a study on infants, one of the characteristics measured was head circumference. The mean head circumference of 11 infants was 34.1 centimeters (cm). Complete parts (a) through (d) below. (A). Assuming that head circumferences for infants are normally distributed with standard deviation 1.6 cm, determine a 95% confidence interval for the mean head circumference of all infants. The confidence interval for the mean head circumference of all infants is fromIn a study on infants, one of the characteristics measured was head circumference. The mean head circumference of 11 infants was 34.1 centimeters (cm). Complete parts (a) through (d) below. (A). Assuming that head circumferences for infants are normally distributed with standard deviation 1.6 cm, determine a 95% confidence interval for the mean head circumference of all infants. The confidence interval for the mean head circumference of all infants is from.