A Typical Case Study

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Looking at page-6 & page-7 of the results, it is clear that the factors with the most significant effect on weight are,

1. Cooling Time (19.6%)
2. Temperature (16.12%)
3. Interaction between Temperature & Pressure (6.54%)
4. Additive (4.92%)

leaving 47% of the variations unexplained.

It can also be seen that Weight increases with,

1. Increasing Cooling Time
2. Increasing Temperature
3. Increasing Additive & Pressure
4. Decreasing Time

This means that to get the maximum weight (our optimisation criteria), the optimum levels would be,

• Cool Time-2
• Temperature-2
• Additive-2
• Pressure-2

, and so on.

The interaction effect plot also indicates that maximum weight is achieved at,

• Pressure-2 / Temperature-2

This is not n conflict (not necessarily always the case) with our main effect optimum settings.