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The following information was obtained from independent random samples. The Degrees of Small Sample Size: Use t-value Sample 1 Sample 2 Sample Mean 45 42 Sample Variance 85 90 Sample Standard Deviation Sample Size 10 12 Standard Error Confidence Coefficient 0.95 Level of Significance Degrees of Freedom 19 t-value Margin of Error Point Estimate of Difference Lower Limit Upper Limit 37. The point estimate for the difference between the means of the two populations is: 38. The standard error of X1 - X2 is 39. The t-value for the sample is 40. The 95% confidence interval for the difference between the two population means is to