A study was conducted to determine the effect of thread count (x1) and the percentage of cotton (x2) on the lifetime of standard twin bed sheets (y, in years). A machine was constructed to simulate continued usage and to allow a measurement of the lifetime.
Many of the highways in Pennsylvania are paved with concrete rather than tar. Suppose an experiment was conducted to determine whether the compression strength in cured concrete pavement (y, psi) is affected by the water-to-cement ratio (x1), the sand-to-cement ratio (x2), the percentage of fly ash (x3), and/or the ambient temperature during curing (x4, °F).
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