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 “model” to forecast e-commerce sales for the third quarter of the year2013.
Answer to relevant QuestionsDetermine the Pearson product-moment correlation coefficient for the followingdata.Determine the equation of the trend line through the following cost data. Use the equation of the line to forecast cost for year 7.Year ... Cost ($ millions)1 ..... 562 ..... 543 ..... 494 ..... 465 ..... 45People in the aerospace industry believe the cost of a space project is a function of the weight of the major object being sent into space. Use the following data to develop a regression model to predict the cost of a space ...Compute r2 for Problem 12.26 (Problem 12.8). Discuss the value of r2 obtained.Study the Minitab output shown in Problem 13.7.Comment on the overall strength of the regression model in light of S, R2, and adjustedR2.
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