You survey consumer confidence (on an ordinal scale from 1 = low to 5 = high). The participants in your survey are also asked about their income and are classified into one of four income groups (1 =...

You survey consumer confidence (on an ordinal scale from 1 = low to 5 = high). The participants in your survey are also asked about their income and are classified into one of four income groups (1 = low, 2 = medium, 3 = high, 4 = out-ofsight). You believe that there will be differences in typical confidence by income group, but do not necessarily think it will be a trend.