A health   care company reported that an insured woman spends on average 1.94 days in   the hospital for childbirth, while an uninsured woman spends an average of   1.21 days. Assume two samples of 15 women each were used in both samples. The   standard deviation of the first sample is equal to .80 a day, and the second   group is .40. At a= .0025, the objective is to test the claim that the means   are equal. Round to two decimal places. The question wants to know this:   (blank)< mean 1 minus mean 2< (blank) what is the critical value? what   is the test value?