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Classify the following as cross-section or time-series data. 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 1.21 Classify the following as cross-section or time-series data. a. Average prices of houses in 100 cities b. Salaries of 50 employees c. Number of cars sold each year by General Motors from 1980 to 2012 d. Number of employees employed by a company each year from 1985 to 2012
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