1. Each month the Bureau of Labor Statistics in the U.S. Department of Labor conducts the "Current Population Survey" (CPS), which provides data on labor force characteristics of the population. The attached excel file CPS12 contains the data for 2012. In the data file, you will see five variables:

female: =1 if female; =0 if male

year: year

ahe: average hourly earnings

bachelor: =1 if worker has a bachelor's degree; =0 if worker has a high school degree age: age (years)

(a) Are the data in CPS12 cross-sectional, time-series, or panel data?

(b) If you are a researcher, what research question(s) do you want to study based on this dataset? Please describe an example and list the variables you may use to answer your question(s).