Process energy cost data

A company uses two processes to manufacture plastic pellets. Because energy is a major cost, the supervisor wants to try a new source of energy. Each month, the supervisor changes the energy source. The first month, the supervisor uses energy source A (the old source). The second month, the supervisor uses energy source B (the new source), and so on. The supervisor measures the monthly energy cost of each process.

You can use this data to demonstrate overlaid Time Series Plot and other analyses that compare times series variables.