Back in the late 1990s, AOL was the dominant Internet provider. It charged an hourly rate for

Question:

Back in the late 1990s, AOL was the dominant Internet provider. It charged an hourly rate for online access. However, AOL was slow to respond to changes in the Internet business model and lost a significant amount of market share. Today, advertising revenue is a major source of income for the company. The following data show the advertising revenue, in millions of dollars, for each quarter over a recent three year period. These data can also be found in the Excel file AOL.xlsx.