Jennifer wants to study motor-pursuit performance (tracking a moving light with a hand-held wand) under each of three conditions of distraction, high, medium, and low.
Instead of using three separate groups of participants, she makes sure her groups are equivalent by testing the same 12 participants under all three conditions of distraction. She finds that performance is poorest in the first (high distraction) condition, better in the second (medium distraction), but best in the third (low distraction) condition. She concludes that performance is hindered by distraction. What is the problem with this interpretation?
a. her participants could have improved simply with practice over the three conditions
b. comparisons like that should only be made across separate groups of people
c. twelve participants are not enough to allow for such conclusions
d. you can't measure and compare a variable like motor pursuit performance over time
Question 2
In describing participants you should be careful not to use biased or demeaning terms. There are three particular areas to be careful about. Which of the following is NOT one of them?
a. species
b. gender
c. race
d. disabilities
Hand muscle
Biology deals with the study of the many varieties of living organisms.
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