Question: Health care knowledge systems reported that an insured woman spends on average 2.3 days in the hospital for a routine childbirth, while an uninsured woman spends on average 1.9 days. Assume two samples of 16 women each were used and the standard deviations are both equal to 0.6 day. At α = 0.01, test the claim that the means are equal. Find the 99% confidence interval for the differences of the means. Use the P-value method.