How many levels were used in the experiment?

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Q: TABLE B.2 Solar Thermal Energy Test Data y X₂ 271.8 783.35 33.53 264.0 748.45 36.50 238.8 684.45…

A: Given: y x1 x2     x3     x4 x5     271.8 783.35 33.53 40.55 16.66 13.2 264 748.45 36.5 36.19…