Question 9 Construct a 95% confidence interval for the average value of y for the following data 12 21 28 8 20 17 15 19 24 Use x = 25, se = 3.94, and the equation of the regression line, y^=16.5+0.162x (Do not round the intermediate values. Round your answers to 2 decimal places.) 12.55 025) s_ 28.59 Question 10 After a somewhat uncertain start, e-commerce sales in the United States have been growing for the past several years. Shown below are quarterly 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 "model" to forecast e-commerce sales for the third quarter of the year 2013