After a somewhat uncertain start, e-commerce sales in the United States have been growing for the past

Question:

After a somewhat uncertain start, e-commerce sales in the United States have been growing for the past several years. Shown below are quarterly adjusted e-commerce sales figures ($ billions) released by the Census Bureau for the United States over a three-year period. Use these data to determine the equation of a trend line for e-commerce sales during this time and use the trend €œmodel€ to forecast e-commerce sales for the third quarter of the year2013.