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Question: In an experiment designed to study the effects of illumination level on task performance, subjects were required to insert a fine-tipped probe into the eyeholes of ten needles in rapid succession both for a low light level with a black background & again at a higher light level with a white background. Each data value is the time [in seconds] to complete the task.
Subject
1
2
3
4
5
6
7
8
9
Black
28.85
28.84
32.05
25.74
20.89
41.05
25.01
24.96
27.47
White
18.23
20.84
22.96
19.68
19.50
24.98
16.61
16.07
24.59
Does the data indicate at the 0.02 level that the higher level of illumination with a white background yields a decrease of more than five seconds in the true mean completion time of the task?
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