A study of Iron deficiency among infants compared blood hemoglobin levels of a random sample of one-year-old Infants who had been breast-fed to a random sample of one-year old Infants who had been fed with standard infant formula. Here are the results. We wish to test the hypothesis H0: [13 pF = 0 against Ha: pB pF a: CI. where p3 and pF are the population mean blood hemoglobin levels for breast-fed and formula-fed infants, respectively. at the a = 0.05 significance level. Breast-fed infants - Formula-fed infants 13 4 What additional information would you need to confirm that the * 1 point conditions for this test have been met? 0 If the subjects were randomly assigned to the two treatment groups. 6) That that there were no outliers in the samples and we should plot the data to determine whether there is strong skew present. 0 Nothing; all conditions are met and we can proceed. Assuming the conditions have been met. calculate the test statistic for * 2 points this test. [Round to the nearest thousandths {3 decimal places]. if necessary]