How universal is the notion of “green light good, red light bad”? The article “Effects of Personal Experiences on the Interpretation of the Meaning of Colours Used in the Displays and Controls in Electric Control Panels” (Ergonomics 2015: 1974–1982) reports the results of a survey of 144 people with occupations related to electrical equipment and 206 people in unrelated fields. Each person was asked to identify the correct meaning of colored panel lights; the accompanying data shows answers for the color red.

Does the data indicate a difference in how those with electrical equipment experience and those without understanding the meaning of a red panel light? Test at the .01 significance level. Discuss your findings.

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Occupation Elec. Equip. Other Red Light Meaning? Normal situation Emergency situation 86 185 40 5 Other/ unknown 18 16