Below is a time series data for sales revenue of a business in Chicago for the past 6 years ...

     Below is a   time series data for sales revenue of a business in Chicago for the past 6   years. Develop the equation for the linear trend line component for this time   series. What do you think is happening at this business? Draw a graph to   confirm your calculations. What is the likely sales volume in the 7th year?      Year Sales ($, m)   1 18.8   2 19.1   3 19.0   4 19.5   5 20.2   6 20.5