A Product That Is Seasonally Based on Quarterly Demand and the Demand

question 27

Essay

A product that is seasonally based on quarterly demand and the demand for the past three years is given below. There is no trend but there is seasonality. Average quarterly demand is 100 units. Calculate the seasonal index for the four quarters. $$\begin{array} { l l l l l } \text { Year } & \text { Q1 } & \text { Q2 } & \text { Q3 } & \text { Q4 } \\2005 & 122 & 108 & 81 & 90 \\2006 & 130 & 100 & 73 & 96 \\2007 & 132 & 98 & 71 & 99\end{array}$$

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Definitions:

Therapeutic Half-life

The time required for the concentration of a drug in the body to decrease to half of its starting dose, which is crucial in determining the drug's dosage and scheduling.

Elimination Half-life

The time it takes for the concentration of a substance in the blood to be reduced by half, an important measure in pharmacokinetics.

Distribution Half-life

The time it takes for a drug or substance to reduce to half its initial quantity in the body due to distribution processes.

Administration Half-life

The time required for the concentration of a drug in the body to be reduced by half after its administration, a key factor in determining the dosage and frequency of medication.