The file S02_16.xlsx contains traffic data from 256 weekdays on four variables. Each variable lists the number of arrivals during a specific 5-minute period of the day.
a. What would it mean, in the context of traffic, for the data in the four columns to be positively correlated? Based on your observations of traffic, would you expect positive correlations?
b. Create a table of correlations and check whether these data behave as you would expect.