To compare the mean lifespans of African elephants in the wild and in a zoo, you randomly select several lifespans from both locations. The results are shown below. Construct a 95% confidence interval for the difference in mean lifespans of elephants in the wild and in a zoo.

Sample Statistics for African Elephant Lifespans

Construct the indicated confidence interval for μ₁ - μ₂. Assume the populations are approximately normal with unequal variances.

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Wild 56.0 yr 20 200 16.9 yr S1 8.6 yr23.8 yr n2 12