A 90% confidence interval for 1 2 using the paired difference sample results x

A 90% confidence interval for μ₁ − μ₂ using the paired difference sample results x̅_d = 556.9, s_d = 143.6, n_d = 100

Use a t-distribution to find a confidence interval for the difference in means μ₁ − μ₂ using the relevant sample results from paired data. Give the best estimate for μ₁ − μ₂, the margin of error, and the confidence interval. Assume the results come from random samples from populations that are approximately normally distributed, and that differences are computed using d = x₁ − x₂.