An experiment was done to compare the effect of having a conversation via a hands-free mobile phone, having a conversation with an in-car passenger, and no distraction (baseline) on driving accuracy. Twenty participants from two different age groups (18-25 years and 26-40 years) took part. All participants in both age groups took part in all three conditions of the experiment (in counterbalanced order), and their driving accuracy was measured by a layperson who remained unaware of the experimental hypothesis. Which of the following sentences regarding the results of the simple contrasts of the distraction variable is correct? a. If we ignore all other variables, the driving accuracy of participants who were between the ages of 18 and 25 years were similar to that of participants who were between the ages of 26 and 40 years.
b. If we ignore all other variables, participants who were between the ages of 18 and 25 years performed significantly differently than participants who were between the ages of 26 and 40 years.
c. Participants who were between the ages of 18 and 25 years were less accurate drivers than participants who were between the ages of 26 and 40 years. This was a large effect.
d. The decline in accuracy across the distraction groups was more pronounced for the younger drivers.