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.
Use the normal approximation for the Mass-Whitney U test to analyze the data above. (Round your answer to two decimal places.)
z = -1.83
State whether to retain or reject the null hypothesis. (Assume alpha equal to 0.05.)
