Name the variable or variables in this graph, and tell whether they are measured as nominal, ordinal, or interval. One variable is ethnicity, measured as African American, Caucasian, Hispanic, and Other. Another variable is time. Measured intervally, by year. Another variable is age.
Age is controlled.
The population is that of the California Youth Authority, a population between the ages of 12-25. The data may also have been controlled on gender, since this seems to be based on data for juvenile males. No, the answer is not readily apparent because there is no accompanying written explanation of the graph. This is why having an explanatory paragraph is so important. In all likelihood, however, the CYA, accepted the ethnic designation on prior court records.