Classify the following as cross-section or time-series data. a. Food bill of a family for each month
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a. Food bill of a family for each month of 2012
b. Number of armed robberies each year in Dallas from 1998 to 2012
c. Number of supermarkets in 40 cities on December 31, 2011
d. Gross sales of 200 ice cream parlors in July 2012
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