In a study on infants, one of the characteristics measured vas head circumference. The mean head circumference of 11 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 1.7 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 cm to cm. (Round to one decimal place as needed.)