A researcher was interested in knowing if preterm infants with late metabolic acidosis and preterm infants without the condition differ with respect to urine levels of a certain chemical. The mean levels, standard deviations, and sample sizes for the two samples studied were as follows:

Sample Group 1 (With condition) 15 8.5 5.5 Group 2 (Without condition) 20 4.8 3.6 Let #1: the true population average urine level with condition and /2: the true population average urine level without condition. Test Ho : #1 = p2 vs Ha : # # #42. We assume two populations are normally distributed and variances are same: of = 03. Let a = .05. (a) Compute the test statistic and the p-value. (b) Conclusion (Accept H. or Reject H.). (c) Construct 95% confidence interval for #1 - /42