Question: 4 20 people each perform a sensori-motor task in two conditions, one in a quiet room, alone, the other in a brightly lit room with

4 20 people each perform a sensori-motor task in two conditions, one in a quiet room, alone, the other in a brightly lit room with a dozen people watching. An electronic timer takes an accurate record of the number of errors made in each condition.

(a) What test would be appropriate for investigating the significance of the differences in performance between the two conditions?

(b) Assume everybody deteriorates in the second condition. What test would be appropriate for seeing whether individuals tend to deteriorate to the same degree?

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