17) A professor has a teaching assistant record the amount of time (in minutes) that a sample of 16 students engaged in an active discussion. The assistant observed 8 students in a class who used a slide show presentation and 8 students in a class who did not use a slide show presentation.

With Microsoft Without PowerPoint Microsoft PowerPoint 12 10 21 15 13 9 14 B 19 11 5 6 7 4 23 18 Use the normal approximation for the Mann-Whitney U test to analyze the data above. (Round your answer to two decimal places.) 7 =