Exercise 8.6 Jaundice is observed in newborns when a baby has a high level of bilirubin in the blood. Bilirubin is a yellow substance and is produced by normal degradation of red blood cells. We would like to estimate the average indirect bilirubin level in infants aged 4 days with an average sample of 150 Infants. The average sample of these 150 infants is 5.96 mg/100 cc. Because As the sample size is large, a 95% confidence interval is constructed for the low mean ee over z, and we obtain the interval [5.3279; 6.5921]. (a) Calculate the estimated standard error for estimating the mean. (b) Give the value of the sample deviation for these 150 infants. (c) Without calculating the interval, do you expect a 97% confidence interval for the average will be longer, shorter or the same length in comparison with the interval 'a 95% above. (Why?) (d) Give a 97% confidence interval for the indirect bilirubin seric level average in infants aged 4 days.