The report Trends in Higher Education (www. college board.com) gave the accompanying data on smoking rates for
Question:
a. Construct a time series plot for people who did not graduate from high school, and comment on any trend over time.
b. Construct a time series plot that shows trend over time for each of the four education levels. Graph each of the four time series on the same set of axes, using different colors to distinguish the different education levels. Either label the time series in the plot or include a leg-end to indicate which time series corresponds to which education level.
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