Classify the following as cross-section or time-series data. a. Food bill of a family for each month

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Classify the following as cross-section or time-series data.
a. Food bill of a family for each month of 2015

b. Number of accidents each year in Dallas from 2000 to 2015
c. Number of supermarkets in each of 40 cities as of December 31, 2015
d. Gross sales of 200 ice cream parlors in July 2015

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