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
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 and a higher level with a white background. Each data value is the time (sec) required to complete the task.
Subject | |||||||||
---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
Black | 26.94 | 36.39 | 34.77 | 40.98 | 22.08 | 30.72 | 27.48 | 40.71 | 24.78 |
White | 19.22 | 20.92 | 24.66 | 19.05 | 22.28 | 21.43 | 22.96 | 20.24 | 22.45 |
Does the data indicate that the higher level of illumination yields a decrease of more than 5 sec in true average task completion time? Test the appropriate hypotheses using the P-value approach. (Use = 0.01. Give t to 1 decimal place and the p-value to 3 decimal places.)
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