7.49 Smaller sample sizes. Refer to the previous exercise. Suppose instead that the two classes are smaller, so the summary statistics are , , s₁ = 11.53, s₂ = 15.33, n₁ = 16, and n₂ = 14. Find a 95% confidence interval for the difference using the second approximation for degrees of freedom. Compare this interval with the one in the previous exercise and discuss the impact smaller sample sizes have on a confidence interval.