From a random sample of 6 students in an introductory finance class that uses group-learning techniques, the mean examination score was found to be 77.45 and the sample standard deviation was 2.3. For an independent random sample of 9 students in another introductory finance class that does not use group-learning techniques, the sample mean and standard deviation of exam scores were 70.45 and 8.7, respectively. Estimate with 99% confidence the difference between the two population mean scores; do not assume equal population variances. Click the icon to view the Student's t distribution table. The 99% confidence interval is from a lower limit of to an upper limit of (Round to two decimal places as needed.)

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