A study of iron deficiency among infants compared samples of infants following different feeding regimens. One group contained breast-fed infants, while the children in another group were fed a standard baby formula without any iron supplements. Here are summary results on blood hemoglobin levels at 12 months of age. Group n x sBreast-fed 22 13.2 1.7Formula 18 12.5 1.8carry out a t test. Give the P-value. (Use ? = 0.01. Round your value for t to three decimal places, and round your P-value to four decimal places.)t = P-value = (b) Give a 95% confidence interval for the mean difference in hemoglobin level between the two populations of infants. (Round your answers to three decimal places.)