What statistical tool should be used when you want to compare 4 refrigerators to know if there is a significant differences among them in terms of: 1. Energy efficiency factor (EEF) = volume cooled (L) / energy consumption (kWh/24h) 2. Energy consumption (kWh/24h) 3. Rated power input (W) 4. Price ($) Example data:   EEF Energy consumtion (kWh/24h) Rated power input (HP) Price Ref 1  254 1.00 0.0952 20,239.56 Ref 2 431 0.51 0.0738 17,495.00 Ref 3 260 1.09 0.1408 18,700.00 Ref 4 260 1.17 0.1408  22,100.00

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