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A professor has a teaching assistant record the amount of time (in minutes) that a sample...

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
PowerPoint		 Without
Microsoft
PowerPoint
18 4
21 5
13 23
15 9
8 12
11 7
19 14
10 6

Use the normal approximation for the Mann-Whitney U test to analyze the data above. (Round your answer to two decimal places.)
z =

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