Question: 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 population of the urines levels in the two groups is known to be approximately normally distributed. The mean levels, standard deviations, and sample sizes for the two samples studied were as follows:

1. Parameter =
2. Statistic =
3. Construct a 95% Confidence Interval for the difference in mean for these two populations -Make sure to check your conditions!
4. What should the researcher conclude on the basis of these results? Let .

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