Preterm infants with late metabolic acidosis (n=38) were compared to preterm infants without the condition (n=42) with respect to the level of a certain chemical in their urine. The infants with the condition had a mean level of 8.9 with a standard deviation of 5.4, while infants without the condition had a mean level of 5.0 with a standard deviation of 3.8. Construct a two-sided 95% confidence interval for the difference between the two means. Using the confidence interval, test the null hypothesis µ1=µ2 against a two-tailed alternative. What is your conclusion?