A task requires the completion of four activities. A teacher would like to know if differences in the sequence of the four activities results in different task completion times. The teacher selects three students and demonstrates the activities in random order to the students. Then each student completes the task with each of the activity sequences. The completion times are recorded. The following table shows the minutes for each student to complete each task.

Using the .05 level of significance:
a. Is there a difference in the task completion times among the different sequences?
b. Is there a difference in task completion times between the students?

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Time (minutes) Sequence Allen Carla Henry 22.4 20.8 21.5 17.0 19.4 20.7 21.2 19.2 20.2 20.3 D 18.6 20.4