Abstract
The purpose of this project was to determine what effects, if any, lighting and density of product had upon the inspection process. Therefore, there were three levels of lighting and three different groupings, i.e., one, two, or three resistors. Four different subjects were used, each completing the test twice. The inspection procedure consisted of identifying bad resistors on a moving belt conveyor. Subjects were required only to call out the number of bad resistors out of each group. It was not necessary for the subject to sort out the good from the bad. The color coding of the resistors provided for the discrimination. The subjects' performances were scored three ways: Type I errors in which a subject accepted a bad resistor; Type II errors in which a good resistor was accepted; and the combination or sum of the two. The results of the experiment showed a definite difference in the effect of the lowest light level as compared to the higher two. The number of resistors in a group displayed consistent statistical significance only between the first and last levels; i.e., those containing one and three resistors, respectively.
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