Question: 4. Consider the significant autocorrelations,r12 and r24, for the differenced data.Would you conclude that the sales first differenced have a seasonal component? If so, what

4. Consider the significant autocorrelations,r12 and r24, for the differenced data.Would you conclude that the sales first differenced have a seasonal component? If so, what are the implications for forecasting, say, the monthly changes in sales?

Autocorrelation 1.0- 0.8- Autocorrelation Function for Mr. Tux Sales 0.6- 0.4- 0.2-

0.0- -0.2- -0.4- -0.6- -0.8- -1.0- FN 2 10 12 14 Lag

Autocorrelation 1.0- 0.8- Autocorrelation Function for Mr. Tux Sales 0.6- 0.4- 0.2- 0.0- -0.2- -0.4- -0.6- -0.8- -1.0- FN 2 10 12 14 Lag 5- 16 18 20 22 1989- FIGURE 25 Autocorrelation Function for Mr. Tux Data 24

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