Problem

German e-Commerce Sales Retail e-commerce sales in Germany (excluding event tickets,...

German e-Commerce Sales Retail e-commerce sales in Germany (excluding event tickets, financial products, and travel) are shown below.

a. Why is a cubic model appropriate for the data?

b. Align the input to years since 2000. Write a cubic model for the aligned data.

c. Write the input value for the approximate location of the inflection point.

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Solutions For Problems in Chapter 1.11

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