Question: 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

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 2009

d. Number of employees employed by a company each year from 1985 to 2009

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