Job performance under time pressure. Refer to the Academy of Management Journal (October 2015) study of how time pressure affects team job performance, Exercise 12.89 (p. 768). Recall that the researchers hypothesized a complete second-order model relating team performance 1y2 to perceived time pressure 1x12, and whether or not the team had an effective leader 1x2 = 1 if yes, 0 if no2: E1y2 = b0 + b1x1 + b2x1 2 + b3x2 + b4x1x2 + b5x1 2 x2

a. How would you determine whether the rate of increase of team performance with time pressure depends on effectiveness of the team leader?

b. For fixed time pressure, how would you determine whether the mean team performance differs for teams with effective and noneffective team leaders?