One group of accounting students used simulation programs, while another group received a tutorial. Scores on an exam were compared.

Statistic Simulation Tutorial

Mean score x1 = 9.0 x2 = 10.8

Sample std. dev. s1 = 2.0 s2 = 2.1

Number of students n1 = 30 n2 = 30

a.Construct a 99 percent confidence interval for the true difference in mean scores.(Round your answers to 2 decimal places. Negative values should be indicated by a minus sign.)

The 99% confidence interval is fromto.

b.Do you think the learning methods have significantly different results?

• No
• Yes