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I am look at results of a likert scale and trying to establish statistical significance of the difference in percentage of 'top box' scores. Since the frequency distribution of the likert scale is non-normal I figured categorizing the top box is the best test for this. I am pretty sure I need...

We recently finished a survey using a likert scale to compare attributes of consumer packaging(sample question below). The same question was asked of two different consumer packages. Given the likert scale is ordinal a)is it valid to calculate a weighted mean to compare the responses...