7.48 Two-sample t confidence interval. Suppose a study similar to Example 7.11 was performed using two second-grade classes. Assume the summary statistics are , , s₁ = 11.53, s₂ = 15.33, n₁ = 26, and n₂ = 24. Find a 95% confidence interval for the difference between the treatment (Group 1) and the control (Group 2) means using the second approximation for degrees of freedom. Also write a one-sentence summary of what this confidence interval says about the difference in means.