Because the Levene’s test for equality of variances is not significant, the standard practice is to assume equal variances. What is the appropriate t-value?

You are conducting a small study at your hospital looking at infants born in the first 24 hours after the conclusion of a hurricane. You classify prematurity status as full term (0) if the infants are born after 37 weeks of gestation and premature (1) if they are born before 37 weeks of gestation. You measure birth weight in grams at the time of delivery. You conduct a t-test to see whether the mean birth weights differ between the premature and full-term infants. See Table 9-8 and Figure 9-7.

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TABLE 9-8 Preterm Status Birth weight 0 1 Mean Birth Weight for Full-Term and Premature Infants I 6 4 Group Statistics Mean 3453.3333 1225.0000 Standard Deviation 435.41551 357.07142 Standard Error Mean 177.75764 178.53571