1. In a study of maternal cigarette smoking and bone density in newborns, 77 infants of mothers who smoked had a mean bone mineral content of 0.098 g/cm³ (s₁ = 0.026 g/cm³). The 161 infants whose mothers did not smoke had a mean bone mineral content of 0.095 g/cm³ (s₂ = 0.025 g/cm³).
2. Calculate the 95% confidence interval for ₁ - ₂.

1. Based on the confidence interval you just calculated, is there a statistically significant difference in bone mineral content between newborns with mothers who did smoke and newborns with mothers who did not smoke?