Question: Refer to Exercise 20.19. Use regression analysis to calculate the linear and quadratic trends. Which line fits better? In exercise 20.19 Plot the following time

Refer to Exercise 20.19. Use regression analysis to calculate the linear and quadratic trends. Which line fits better?

In exercise 20.19

Plot the following time series to determine which of the trend models appears to fit better.

Period Time Series Period Time Series 3 49 47 53 57 55 8 10 41 39 28 33 20 4. 2.

Period Time Series Period Time Series 3 49 47 53 57 55 8 10 41 39 28 33 20 4. 2.

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