Briefly explain:

a. Why we cannot use the median to summarize nominal variables

b. Why we cannot use the mean to summarize ordinal variables

c. What types of plots are appropriate to visualize a 4-category ordinal variable (agree/somewhat agree/somewhat disagree/disagree)?

d. What types of plots are appropriate to visualize a categorical variable with 3 unique categories (e.g., emergency/urgent/elective hospital admission)?

e. What types of plots are appropriate to visualize a categorical variable with 20 unique categories (e.g., emergency/urgent/elective hospital admission)?

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