Question 2: A High Street chemist sells travel first aid packs. The numbers of these sold over three years were: Quarter 2 Quarter Quarter 3 Quarter 4 Year 1 11 37 61 18 Year 2 13 49 58 16 16 53 66 18 Year 3 e. Using Multiplicative decomposition modal generate forecast for year 4.

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.