Strayer, Drews, and Crouch XXXXXXXXXXwhich we saw set up as a between-subjects design in Exercise XXXXXXXXXXexamined the effects of cell phone use on driving ability. They had 40 drivers drive while...

Strayer, Drews, and Crouch (2006) (which we saw set up as a between-subjects design in Exercise 11.32) examined the effects of cell phone use on driving ability. They had 40 drivers drive while speaking on a cell phone, drive while at the legal limit for alcohol (0.08%), and drive under normal conditions. (The conditions were counterbalanced across drivers.) The data for this study are found at www.uvm.edu/~dhowell/methods8/DataFiles/Ex14-29. dat. (I assumed interitem correlations of approximately .45.) Their hypothesis, based on the research of others, was that driving while speaking on a cell phone would have as much of an effect as driving while intoxicated. The dependent variable in this example is “braking reaction time.” The data have exactly the same means and standard deviations as they found.

a. Run the analysis of variance for a repeated measures design.

b. Use the appropriate contrasts to compare the three conditions. Did the results support the experimenters’ predictions?