Question: The data in the following table represent the consumer price index (CPI) for Australia from the September quarter 2006 to the September quarter 2011. a.

The data in the following table represent the consumer price index (CPI) for Australia from the September quarter 2006 to the September quarter 2011.

a. Plot the data.

b. Calculate a linear trend forecasting equation and plot the trend line.

c. Calculate a quadratic trend forecasting equation and plot the results.

d. Calculate an exponential trend forecasting equation and plot the results.

e. Which model is the most appropriate?

f. Using the most appropriate model, forecast the CPI for the December quarter 2011. Compare this to the actual value – see .

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